| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.8%
|
|
| 1986 | 1 |
0.8%
|
|
| 1988 | 1 |
0.8%
|
|
| 1990 | 2 |
1.6%
|
|
| 1993 | 1 |
0.8%
|
|
| 1994 | 3 |
2.3%
|
|
| 1995 | 1 |
0.8%
|
|
| 1996 | 1 |
0.8%
|
|
| 1997 | 2 |
1.6%
|
|
| 1998 | 4 |
3.1%
|
|
| 1999 | 2 |
1.6%
|
|
| 2000 | 5 |
3.9%
|
|
| 2002 | 2 |
1.6%
|
|
| 2003 | 8 |
6.3%
|
|
| 2004 | 12 |
9.4%
|
|
| 2005 | 14 |
10.9%
|
|
| 2006 | 13 |
10.2%
|
|
| 2007 | 21 |
16.4%
|
|
| 2008 | 29 |
22.7%
|
|
| 9999 | 5 |
3.9%
|
|
| Sysmiss | 318 |