| Value | Category | Cases | |
|---|---|---|---|
| 0 | 358 |
74.9%
|
|
| 1980 | 1 |
0.2%
|
|
| 1985 | 1 |
0.2%
|
|
| 1988 | 1 |
0.2%
|
|
| 1990 | 3 |
0.6%
|
|
| 1994 | 1 |
0.2%
|
|
| 1995 | 1 |
0.2%
|
|
| 1998 | 2 |
0.4%
|
|
| 2000 | 8 |
1.7%
|
|
| 2002 | 1 |
0.2%
|
|
| 2003 | 2 |
0.4%
|
|
| 2004 | 4 |
0.8%
|
|
| 2005 | 7 |
1.5%
|
|
| 2006 | 3 |
0.6%
|
|
| 2007 | 6 |
1.3%
|
|
| 2008 | 27 |
5.6%
|
|
| 2009 | 20 |
4.2%
|
|
| 2010 | 31 |
6.5%
|
|
| 2011 | 1 |
0.2%
|
|
| Sysmiss | 2 |