| Value | Category | Cases | |
|---|---|---|---|
| 1969 | 4 |
0.2%
|
|
| 1973 | 5 |
0.2%
|
|
| 1979 | 12 |
0.5%
|
|
| 1980 | 26 |
1.2%
|
|
| 1981 | 6 |
0.3%
|
|
| 1982 | 12 |
0.5%
|
|
| 1985 | 15 |
0.7%
|
|
| 1986 | 11 |
0.5%
|
|
| 1989 | 4 |
0.2%
|
|
| 1990 | 50 |
2.2%
|
|
| 1991 | 11 |
0.5%
|
|
| 1992 | 9 |
0.4%
|
|
| 1993 | 7 |
0.3%
|
|
| 1994 | 16 |
0.7%
|
|
| 1995 | 6 |
0.3%
|
|
| 1996 | 4 |
0.2%
|
|
| 1997 | 18 |
0.8%
|
|
| 1998 | 65 |
2.9%
|
|
| 1999 | 20 |
0.9%
|
|
| 2000 | 122 |
5.4%
|
|
| 2001 | 28 |
1.2%
|
|
| 2002 | 33 |
1.5%
|
|
| 2003 | 33 |
1.5%
|
|
| 2004 | 53 |
2.3%
|
|
| 2005 | 65 |
2.9%
|
|
| 2006 | 63 |
2.8%
|
|
| 2007 | 36 |
1.6%
|
|
| 2008 | 69 |
3.1%
|
|
| 2009 | 103 |
4.6%
|
|
| 2010 | 189 |
8.4%
|
|
| 2011 | 73 |
3.2%
|
|
| 2012 | 165 |
7.3%
|
|
| 2013 | 209 |
9.3%
|
|
| 2014 | 504 |
22.3%
|
|
| 2015 | 211 |
9.3%
|