| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 2 |
4%
|
|
| 1983 | 1 |
2%
|
|
| 1984 | 2 |
4%
|
|
| 1992 | 2 |
4%
|
|
| 1998 | 3 |
6%
|
|
| 1999 | 1 |
2%
|
|
| 2004 | 3 |
6%
|
|
| 2005 | 7 |
14%
|
|
| 2006 | 14 |
28%
|
|
| 2007 | 12 |
24%
|
|
| 2008 | 3 |
6%
|
|
| -9 | 50 | ||
| -7 | 33 |