| Value | Category | Cases | |
|---|---|---|---|
| 0 | 79 |
16.5%
|
|
| 1992 | 1 |
0.2%
|
|
| 1995 | 3 |
0.6%
|
|
| 1997 | 1 |
0.2%
|
|
| 1998 | 1 |
0.2%
|
|
| 2000 | 15 |
3.1%
|
|
| 2001 | 5 |
1%
|
|
| 2002 | 11 |
2.3%
|
|
| 2003 | 4 |
0.8%
|
|
| 2004 | 12 |
2.5%
|
|
| 2005 | 28 |
5.9%
|
|
| 2006 | 26 |
5.4%
|
|
| 2007 | 45 |
9.4%
|
|
| 2008 | 54 |
11.3%
|
|
| 2009 | 53 |
11.1%
|
|
| 2010 | 140 |
29.3%
|
|
| Sysmiss | 2 |