| Value | Category | 
                                    
                    
                        | 1984-04-01 |  | 
                                    
                    
                        | 1988-01-01 |  | 
                                    
                    
                        | 1990-03-01 |  | 
                                    
                    
                        | 1990-12-01 |  | 
                                    
                    
                        | 1991-09-01 |  | 
                                    
                    
                        | 1992-02-01 |  | 
                                    
                    
                        | 1993-01-01 |  | 
                                    
                    
                        | 1993-02-01 |  | 
                                    
                    
                        | 1993-08-01 |  | 
                                    
                    
                        | 1993-09-01 |  | 
                                    
                    
                        | 1993-10-01 |  | 
                                    
                    
                        | 1993-11-01 |  | 
                                    
                    
                        | 1994-08-01 |  | 
                                    
                    
                        | 1994-11-01 |  | 
                                    
                    
                        | 1995-10-01 |  | 
                                    
                    
                        | 1996-01-01 |  | 
                                    
                    
                        | 1996-02-01 |  | 
                                    
                    
                        | 1996-10-01 |  | 
                                    
                    
                        | 1997-01-01 |  | 
                                    
                    
                        | 1997-09-01 |  | 
                                    
                    
                        | 1998-11-01 |  | 
                                    
                    
                        | 1999-12-01 |  | 
                                    
                    
                        | 2000-01-01 |  | 
                                    
                    
                        | 2000-02-01 |  | 
                                    
                    
                        | 2000-08-01 |  | 
                                    
                    
                        | 2000-11-01 |  | 
                                    
                    
                        | 2001-04-01 |  | 
                                    
                    
                        | 2001-09-01 |  | 
                                    
                    
                        | 2001-11-01 |  | 
                                    
                    
                        | 2002-01-01 |  | 
                                    
                    
                        | 2002-03-01 |  | 
                                    
                    
                        | 2002-05-01 |  | 
                                    
                    
                        | 2002-08-01 |  | 
                                    
                    
                        | 2002-10-01 |  | 
                                    
                    
                        | 2002-11-01 |  | 
                                    
                    
                        | 2003-01-01 |  | 
                                    
                    
                        | 2003-02-01 |  | 
                                    
                    
                        | 2003-03-01 |  | 
                                    
                    
                        | 2003-06-01 |  | 
                                    
                    
                        | 2003-11-01 |  | 
                                    
                    
                        | 2004-01-01 |  | 
                                    
                    
                        | 2004-04-01 |  | 
                                    
                    
                        | 2004-10-01 |  | 
                                    
                    
                        | 2004-11-01 |  | 
                                    
                    
                        | 2004-12-01 |  | 
                                    
                    
                        | 2005-01-01 |  | 
                                    
                    
                        | 2005-03-01 |  | 
                                    
                    
                        | 2005-05-01 |  | 
                                    
                    
                        | 2005-08-01 |  | 
                                    
                    
                        | 2005-12-01 |  | 
                                    
                    
                        | 2006-01-01 |  | 
                                    
                    
                        | 2006-02-01 |  | 
                                    
                    
                        | 2006-04-01 |  | 
                                    
                    
                        | 2006-06-01 |  | 
                                    
                    
                        | 2006-09-01 |  | 
                                    
                    
                        | 2006-11-01 |  | 
                                    
                    
                        | 2006-12-01 |  | 
                                    
                    
                        | 2007-01-01 |  | 
                                    
                    
                        | 2007-02-01 |  | 
                                    
                    
                        | 2007-03-01 |  | 
                                    
                    
                        | 2007-04-01 |  | 
                                    
                    
                        | 2007-05-01 |  | 
                                    
                    
                        | 2007-07-01 |  | 
                                    
                    
                        | 2007-09-01 |  | 
                                    
                    
                        | 2007-11-01 |  | 
                                    
                    
                        | 2007-12-01 |  | 
                                    
                    
                        | 2008-01-01 |  | 
                                    
                    
                        | 2008-02-01 |  | 
                                    
                    
                        | 2008-05-01 |  | 
                                    
                    
                        | 2008-06-01 |  | 
                                    
                    
                        | 2008-08-01 |  | 
                                    
                    
                        | 2008-09-01 |  | 
                                    
                    
                        | 2008-10-01 |  | 
                                    
                    
                        | 2008-11-01 |  | 
                                    
                    
                        | 2008-12-01 |  | 
                                    
                    
                        | 2009-01-01 |  | 
                                    
                    
                        | 2009-02-01 |  | 
                                    
                    
                        | 2009-03-01 |  | 
                                    
                    
                        | 2009-04-01 |  | 
                                    
                    
                        | 2009-05-01 |  | 
                                    
                    
                        | 2009-06-01 |  | 
                                    
                    
                        | 2009-07-01 |  | 
                                    
                    
                        | 2009-09-01 |  | 
                                    
                    
                        | 2009-11-01 |  | 
                                    
                    
                        | 2010-01-01 |  | 
                                    
                    
                        | 2010-02-01 |  | 
                                    
                    
                        | 2010-03-01 |  | 
                                    
                    
                        | 2010-04-01 |  | 
                                    
                    
                        | 2010-06-01 |  | 
                                    
                    
                        | 2010-07-01 |  | 
                                    
                    
                        | 2010-08-01 |  | 
                                    
                    
                        | 2010-09-01 |  | 
                                    
                    
                        | 2010-10-01 |  | 
                                    
                    
                        | 2010-11-01 |  | 
                                    
                    
                        | 2010-12-01 |  | 
                                    
                    
                        | 2011-01-01 |  | 
                                    
                    
                        | 2011-02-01 |  | 
                                    
                    
                        | 2011-03-01 |  | 
                                    
                    
                        | 2011-04-01 |  | 
                                    
                    
                        | 2011-05-01 |  | 
                                    
                    
                        | 2011-06-01 |  | 
                                    
                    
                        | 2011-07-01 |  | 
                                    
                    
                        | 2011-08-01 |  | 
                                    
                    
                        | 2011-09-01 |  | 
                                    
                    
                        | 2011-10-01 |  | 
                                    
                    
                        | 2011-11-01 |  | 
                                    
                    
                        | 2011-12-01 |  | 
                                    
                    
                        | 2012-01-01 |  | 
                                    
                    
                        | 2012-02-01 |  | 
                                    
                    
                        | 2012-03-01 |  | 
                                    
                    
                        | 2012-04-01 |  | 
                                    
                    
                        | 2012-05-01 |  | 
                                    
                    
                        | 2012-06-01 |  | 
                                    
                    
                        | 2012-07-01 |  | 
                                    
                    
                        | 2012-08-01 |  | 
                                    
                    
                        | 2012-09-01 |  | 
                                    
                    
                        | 2012-10-01 |  | 
                                    
                    
                        | 2012-11-01 |  | 
                                    
                    
                        | 2012-12-01 |  | 
                                    
                    
                        | 2013-01-01 |  | 
                                    
                    
                        | 2013-02-01 |  | 
                                    
                    
                        | 2013-03-01 |  | 
                                    
                    
                        | 2013-04-01 |  | 
                                    
                    
                        | 2013-05-01 |  | 
                                    
                    
                        | 2013-06-01 |  | 
                                    
                    
                        | 2013-07-01 |  | 
                                    
                    
                        | 2013-08-01 |  | 
                                    
                    
                        | 2013-09-01 |  | 
                                    
                    
                        | 2013-10-01 |  | 
                                    
                    
                        | 2013-11-01 |  | 
                                    
                    
                        | 2013-12-01 |  | 
                                    
                    
                        | 2014-01-01 |  | 
                                    
                    
                        | 2014-02-01 |  | 
                                    
                    
                        | 2014-03-01 |  | 
                                    
                    
                        | 2014-04-01 |  | 
                                    
                    
                        | 2014-05-01 |  | 
                                    
                    
                        | 2014-06-01 |  | 
                                    
                    
                        | 2014-07-01 |  | 
                                    
                    
                        | 2014-08-01 |  | 
                                    
                    
                        | 2014-09-01 |  | 
                                    
                    
                        | 2014-10-01 |  | 
                                    
                    
                        | 2014-11-01 |  | 
                                    
                    
                        | 2014-12-01 |  | 
                                    
                    
                        | 2015-01-01 |  | 
                                    
                    
                        | 2015-02-01 |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.