| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 1 |
0.2%
|
|
| 1973 | 1 |
0.2%
|
|
| 1988 | 1 |
0.2%
|
|
| 1990 | 1 |
0.2%
|
|
| 1993 | 1 |
0.2%
|
|
| 1994 | 1 |
0.2%
|
|
| 1996 | 1 |
0.2%
|
|
| 1997 | 1 |
0.2%
|
|
| 1998 | 3 |
0.7%
|
|
| 2000 | 2 |
0.4%
|
|
| 2001 | 3 |
0.7%
|
|
| 2002 | 2 |
0.4%
|
|
| 2003 | 11 |
2.4%
|
|
| 2004 | 5 |
1.1%
|
|
| 2005 | 14 |
3.1%
|
|
| 2006 | 34 |
7.5%
|
|
| 2007 | 74 |
16.3%
|
|
| 2008 | 298 |
65.6%
|
|
| 9999 | Yet to back | 0 |
0%
|
| Sysmiss | 5794 |