| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0.1%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 5 |
0.6%
|
|
| 1996 | 10 |
1.1%
|
|
| 1997 | 15 |
1.7%
|
|
| 1998 | 25 |
2.8%
|
|
| 1999 | 50 |
5.5%
|
|
| 2000 | 56 |
6.2%
|
|
| 2001 | 76 |
8.4%
|
|
| 2002 | 106 |
11.7%
|
|
| 2003 | 130 |
14.4%
|
|
| 2004 | 159 |
17.6%
|
|
| 2005 | 170 |
18.8%
|
|
| 2006 | 98 |
10.9%
|
|
| 2007 | 1 |
0.1%
|
|
| Sysmiss | 19 |