| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
2.5%
|
|
| 2000 | 1 |
2.5%
|
|
| 2002 | 1 |
2.5%
|
|
| 2003 | 1 |
2.5%
|
|
| 2004 | 1 |
2.5%
|
|
| 2005 | 1 |
2.5%
|
|
| 2006 | 9 |
22.5%
|
|
| 2007 | 12 |
30%
|
|
| 2008 | 13 |
32.5%
|
|
| DON'T KNOW | 3 | ||
| MISSING | 4 | ||
| NOT APPLICABLE | 905 |
