| Value | Category | Cases | |
|---|---|---|---|
| 0 | 211 |
44.1%
|
|
| 1970 | 1 |
0.2%
|
|
| 1975 | 1 |
0.2%
|
|
| 1976 | 1 |
0.2%
|
|
| 1980 | 3 |
0.6%
|
|
| 1986 | 1 |
0.2%
|
|
| 1987 | 2 |
0.4%
|
|
| 1988 | 4 |
0.8%
|
|
| 1990 | 5 |
1%
|
|
| 1993 | 2 |
0.4%
|
|
| 1994 | 1 |
0.2%
|
|
| 1995 | 2 |
0.4%
|
|
| 1996 | 2 |
0.4%
|
|
| 1997 | 1 |
0.2%
|
|
| 1998 | 3 |
0.6%
|
|
| 1999 | 1 |
0.2%
|
|
| 2000 | 23 |
4.8%
|
|
| 2001 | 2 |
0.4%
|
|
| 2002 | 10 |
2.1%
|
|
| 2003 | 5 |
1%
|
|
| 2004 | 11 |
2.3%
|
|
| 2005 | 25 |
5.2%
|
|
| 2006 | 31 |
6.5%
|
|
| 2007 | 15 |
3.1%
|
|
| 2008 | 40 |
8.4%
|
|
| 2009 | 29 |
6.1%
|
|
| 2010 | 43 |
9%
|
|
| 2011 | 3 |
0.6%
|
|
| Sysmiss | 2 |