| Value | Category | Cases | |
|---|---|---|---|
| 1976 | 2 |
4.8%
|
|
| 1978 | 1 |
2.4%
|
|
| 1980 | 2 |
4.8%
|
|
| 1985 | 2 |
4.8%
|
|
| 1986 | 2 |
4.8%
|
|
| 1990 | 7 |
16.7%
|
|
| 1991 | 2 |
4.8%
|
|
| 1995 | 1 |
2.4%
|
|
| 1998 | 1 |
2.4%
|
|
| 2000 | 5 |
11.9%
|
|
| 2001 | 1 |
2.4%
|
|
| 2004 | 4 |
9.5%
|
|
| 2005 | 1 |
2.4%
|
|
| 2006 | 1 |
2.4%
|
|
| 2007 | 1 |
2.4%
|
|
| 2008 | 2 |
4.8%
|
|
| 2009 | 2 |
4.8%
|
|
| 2010 | 1 |
2.4%
|
|
| 2011 | 1 |
2.4%
|
|
| 2012 | 2 |
4.8%
|
|
| 2015 | 1 |
2.4%
|