| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 1 |
0.1%
|
|
| 1986 | 2 |
0.2%
|
|
| 1987 | 3 |
0.2%
|
|
| 1988 | 12 |
0.9%
|
|
| 1989 | 15 |
1.1%
|
|
| 1990 | 15 |
1.1%
|
|
| 1991 | 22 |
1.7%
|
|
| 1992 | 29 |
2.2%
|
|
| 1993 | 22 |
1.7%
|
|
| 1994 | 30 |
2.3%
|
|
| 1995 | 26 |
2%
|
|
| 1996 | 31 |
2.4%
|
|
| 1997 | 44 |
3.4%
|
|
| 1998 | 38 |
2.9%
|
|
| 1999 | 38 |
2.9%
|
|
| 2000 | 35 |
2.7%
|
|
| 2001 | 36 |
2.7%
|
|
| 2002 | 43 |
3.3%
|
|
| 2003 | 41 |
3.1%
|
|
| 2004 | 58 |
4.4%
|
|
| 2005 | 42 |
3.2%
|
|
| 2006 | 57 |
4.3%
|
|
| 2007 | 69 |
5.3%
|
|
| 2008 | 91 |
6.9%
|
|
| 2009 | 120 |
9.2%
|
|
| 2010 | 138 |
10.5%
|
|
| 2011 | 156 |
11.9%
|
|
| 2012 | 97 |
7.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 598 |