| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 1 |
0.2%
|
| 1981 | 1 |
0.2%
|
|
| 1988 | 1 |
0.2%
|
|
| 1989 | 1 |
0.2%
|
|
| 1990 | 2 |
0.3%
|
|
| 1992 | 5 |
0.8%
|
|
| 1993 | 3 |
0.5%
|
|
| 1994 | 1 |
0.2%
|
|
| 1995 | 2 |
0.3%
|
|
| 1996 | 3 |
0.5%
|
|
| 1997 | 5 |
0.8%
|
|
| 1998 | 7 |
1.2%
|
|
| 1999 | 7 |
1.2%
|
|
| 2000 | 31 |
5.1%
|
|
| 2001 | 16 |
2.6%
|
|
| 2002 | 20 |
3.3%
|
|
| 2003 | 16 |
2.6%
|
|
| 2004 | 27 |
4.4%
|
|
| 2005 | 31 |
5.1%
|
|
| 2006 | 38 |
6.3%
|
|
| 2007 | 37 |
6.1%
|
|
| 2008 | 59 |
9.7%
|
|
| 2009 | 69 |
11.3%
|
|
| 2010 | 70 |
11.5%
|
|
| 2011 | 75 |
12.3%
|
|
| 2012 | 74 |
12.2%
|
|
| 2013 | 6 |
1%
|
|
| Sysmiss | 1117 |