| Value | Category | 
                                    
                    
                        | 1989-08-01 |  | 
                                    
                    
                        | 2000-02-01 |  | 
                                    
                    
                        | 2000-08-01 |  | 
                                    
                    
                        | 2000-12-01 |  | 
                                    
                    
                        | 2005-01-01 |  | 
                                    
                    
                        | 2005-08-01 |  | 
                                    
                    
                        | 2006-01-01 |  | 
                                    
                    
                        | 2006-06-01 |  | 
                                    
                    
                        | 2006-10-01 |  | 
                                    
                    
                        | 2007-11-01 |  | 
                                    
                    
                        | 2008-10-01 |  | 
                                    
                    
                        | 2009-01-01 |  | 
                                    
                    
                        | 2009-02-01 |  | 
                                    
                    
                        | 2009-11-01 |  | 
                                    
                    
                        | 2009-12-01 |  | 
                                    
                    
                        | 2010-01-01 |  | 
                                    
                    
                        | 2010-03-01 |  | 
                                    
                    
                        | 2010-09-01 |  | 
                                    
                    
                        | 2010-10-01 |  | 
                                    
                    
                        | 2011-01-01 |  | 
                                    
                    
                        | 2011-03-01 |  | 
                                    
                    
                        | 2011-04-01 |  | 
                                    
                    
                        | 2011-05-01 |  | 
                                    
                    
                        | 2011-07-01 |  | 
                                    
                    
                        | 2011-08-01 |  | 
                                    
                    
                        | 2011-10-01 |  | 
                                    
                    
                        | 2011-11-01 |  | 
                                    
                    
                        | 2011-12-01 |  | 
                                    
                    
                        | 2012-01-01 |  | 
                                    
                    
                        | 2012-02-01 |  | 
                                    
                    
                        | 2012-03-01 |  | 
                                    
                    
                        | 2012-04-01 |  | 
                                    
                    
                        | 2012-06-01 |  | 
                                    
                    
                        | 2012-07-01 |  | 
                                    
                    
                        | 2012-08-01 |  | 
                                    
                    
                        | 2012-09-01 |  | 
                                    
                    
                        | 2012-10-01 |  | 
                                    
                    
                        | 2012-12-01 |  | 
                                    
                    
                        | 2013-01-01 |  | 
                                    
                    
                        | 2013-02-01 |  | 
                                    
                    
                        | 2013-03-01 |  | 
                                    
                    
                        | 2013-04-01 |  | 
                                    
                    
                        | 2013-05-01 |  | 
                                    
                    
                        | 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 |  | 
                                    
                    
                        | 2015-11-01 |  | 
                            
            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.