| Value | Category | Cases | |
|---|---|---|---|
| 1958 | 1 |
2.3%
|
|
| 1960 | 3 |
6.8%
|
|
| 1980 | 1 |
2.3%
|
|
| 1990 | 2 |
4.5%
|
|
| 1995 | 1 |
2.3%
|
|
| 1999 | 7 |
15.9%
|
|
| 2000 | 11 |
25%
|
|
| 2001 | 1 |
2.3%
|
|
| 2003 | 1 |
2.3%
|
|
| 2005 | 14 |
31.8%
|
|
| 2007 | 1 |
2.3%
|
|
| 2011 | 1 |
2.3%
|