| Value | Category | Cases | |
|---|---|---|---|
| 1961 | 1 |
0%
|
|
| 1964 | 1 |
0%
|
|
| 1970 | 3 |
0.1%
|
|
| 1973 | 1 |
0%
|
|
| 1977 | 3 |
0.1%
|
|
| 1979 | 511 |
12.8%
|
|
| 1980 | 255 |
6.4%
|
|
| 1981 | 97 |
2.4%
|
|
| 1982 | 255 |
6.4%
|
|
| 1983 | 206 |
5.1%
|
|
| 1984 | 157 |
3.9%
|
|
| 1985 | 122 |
3%
|
|
| 1986 | 64 |
1.6%
|
|
| 1987 | 66 |
1.6%
|
|
| 1988 | 51 |
1.3%
|
|
| 1989 | 55 |
1.4%
|
|
| 1990 | 144 |
3.6%
|
|
| 1991 | 44 |
1.1%
|
|
| 1992 | 76 |
1.9%
|
|
| 1993 | 140 |
3.5%
|
|
| 1994 | 60 |
1.5%
|
|
| 1995 | 71 |
1.8%
|
|
| 1996 | 83 |
2.1%
|
|
| 1997 | 87 |
2.2%
|
|
| 1998 | 89 |
2.2%
|
|
| 1999 | 64 |
1.6%
|
|
| 2000 | 171 |
4.3%
|
|
| 2001 | 94 |
2.3%
|
|
| 2002 | 74 |
1.8%
|
|
| 2003 | 102 |
2.5%
|
|
| 2004 | 81 |
2%
|
|
| 2005 | 122 |
3%
|
|
| 2006 | 106 |
2.6%
|
|
| 2007 | 129 |
3.2%
|
|
| 2008 | 146 |
3.6%
|
|
| 2009 | 132 |
3.3%
|
|
| 2010 | 117 |
2.9%
|
|
| 2011 | 25 |
0.6%
|