| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1987 | 1 |
0.1%
|
|
| 1989 | 3 |
0.4%
|
|
| 1990 | 4 |
0.6%
|
|
| 1991 | 5 |
0.7%
|
|
| 1992 | 6 |
0.9%
|
|
| 1993 | 3 |
0.4%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 3 |
0.4%
|
|
| 1996 | 4 |
0.6%
|
|
| 1997 | 6 |
0.9%
|
|
| 1998 | 6 |
0.9%
|
|
| 1999 | 7 |
1%
|
|
| 2000 | 13 |
1.8%
|
|
| 2001 | 11 |
1.6%
|
|
| 2002 | 14 |
2%
|
|
| 2003 | 20 |
2.8%
|
|
| 2004 | 22 |
3.1%
|
|
| 2005 | 33 |
4.7%
|
|
| 2006 | 46 |
6.5%
|
|
| 2007 | 53 |
7.5%
|
|
| 2008 | 63 |
9%
|
|
| 2009 | 193 |
27.5%
|
|
| 2010 | 159 |
22.6%
|
|
| 8888 | D/K | 25 |
3.6%
|
| 9999 | N/A | 0 |
0%
|
| Sysmiss | 1294 |