| Value | Category | Cases | |
|---|---|---|---|
| 1962 | 1 |
0.4%
|
|
| 1967 | 2 |
0.8%
|
|
| 1968 | 1 |
0.4%
|
|
| 1972 | 1 |
0.4%
|
|
| 1975 | 2 |
0.8%
|
|
| 1976 | 1 |
0.4%
|
|
| 1979 | 1 |
0.4%
|
|
| 1982 | 1 |
0.4%
|
|
| 1985 | 3 |
1.2%
|
|
| 1986 | 1 |
0.4%
|
|
| 1987 | 4 |
1.6%
|
|
| 1988 | 1 |
0.4%
|
|
| 1990 | 1 |
0.4%
|
|
| 1991 | 2 |
0.8%
|
|
| 1993 | 1 |
0.4%
|
|
| 1994 | 1 |
0.4%
|
|
| 1996 | 6 |
2.3%
|
|
| 1997 | 1 |
0.4%
|
|
| 1998 | 5 |
2%
|
|
| 1999 | 1 |
0.4%
|
|
| 2000 | 5 |
2%
|
|
| 2001 | 5 |
2%
|
|
| 2002 | 14 |
5.5%
|
|
| 2003 | 25 |
9.8%
|
|
| 2004 | 20 |
7.8%
|
|
| 2005 | 23 |
9%
|
|
| 2006 | 16 |
6.3%
|
|
| 2007 | 9 |
3.5%
|
|
| 2008 | 8 |
3.1%
|
|
| 2009 | 22 |
8.6%
|
|
| 2010 | 15 |
5.9%
|
|
| 2011 | 6 |
2.3%
|
|
| 2012 | 20 |
7.8%
|
|
| 2013 | 13 |
5.1%
|
|
| 2014 | 12 |
4.7%
|
|
| 2015 | 6 |
2.3%
|