| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 4 |
1.5%
|
|
| 1972 | 1 |
0.4%
|
|
| 1980 | 7 |
2.7%
|
|
| 1984 | 1 |
0.4%
|
|
| 1985 | 2 |
0.8%
|
|
| 1986 | 1 |
0.4%
|
|
| 1988 | 1 |
0.4%
|
|
| 1989 | 1 |
0.4%
|
|
| 1990 | 12 |
4.6%
|
|
| 1992 | 2 |
0.8%
|
|
| 1993 | 1 |
0.4%
|
|
| 1994 | 5 |
1.9%
|
|
| 1995 | 14 |
5.4%
|
|
| 1996 | 4 |
1.5%
|
|
| 1997 | 3 |
1.2%
|
|
| 1998 | 6 |
2.3%
|
|
| 1999 | 3 |
1.2%
|
|
| 2000 | 27 |
10.4%
|
|
| 2001 | 1 |
0.4%
|
|
| 2002 | 11 |
4.2%
|
|
| 2004 | 3 |
1.2%
|
|
| 2005 | 6 |
2.3%
|
|
| 2006 | 19 |
7.3%
|
|
| 2007 | 13 |
5%
|
|
| 2008 | 14 |
5.4%
|
|
| 2009 | 21 |
8.1%
|
|
| 2010 | 39 |
15%
|
|
| 2011 | 20 |
7.7%
|
|
| 2012 | 18 |
6.9%
|
|
| Sysmiss | 203 |