| Value | Category | Cases | |
|---|---|---|---|
| 1966 | 1 |
0.4%
|
|
| 1974 | 1 |
0.4%
|
|
| 1977 | 1 |
0.4%
|
|
| 1987 | 1 |
0.4%
|
|
| 1988 | 3 |
1.2%
|
|
| 1990 | 1 |
0.4%
|
|
| 1995 | 1 |
0.4%
|
|
| 1996 | 1 |
0.4%
|
|
| 1997 | 2 |
0.8%
|
|
| 1998 | 1 |
0.4%
|
|
| 1999 | 1 |
0.4%
|
|
| 2000 | 1 |
0.4%
|
|
| 2001 | 1 |
0.4%
|
|
| 2002 | 4 |
1.6%
|
|
| 2003 | 1 |
0.4%
|
|
| 2004 | 2 |
0.8%
|
|
| 2005 | 3 |
1.2%
|
|
| 2006 | 1 |
0.4%
|
|
| 2007 | 3 |
1.2%
|
|
| 2008 | 8 |
3.3%
|
|
| 2009 | 17 |
6.9%
|
|
| 2010 | 39 |
15.9%
|
|
| 2011 | 37 |
15.1%
|
|
| 2012 | 46 |
18.8%
|
|
| 2013 | 49 |
20%
|
|
| 2014 | 19 |
7.8%
|