| Value | Category | Cases | |
|---|---|---|---|
| 1957 | 1 |
2.5%
|
|
| 1963 | 2 |
5%
|
|
| 1972 | 1 |
2.5%
|
|
| 1974 | 1 |
2.5%
|
|
| 1975 | 1 |
2.5%
|
|
| 1978 | 1 |
2.5%
|
|
| 1984 | 1 |
2.5%
|
|
| 1991 | 1 |
2.5%
|
|
| 1994 | 1 |
2.5%
|
|
| 1997 | 2 |
5%
|
|
| 1998 | 1 |
2.5%
|
|
| 2000 | 1 |
2.5%
|
|
| 2001 | 1 |
2.5%
|
|
| 2002 | 1 |
2.5%
|
|
| 2005 | 2 |
5%
|
|
| 2006 | 3 |
7.5%
|
|
| 2008 | 3 |
7.5%
|
|
| 2009 | 3 |
7.5%
|
|
| 2011 | 2 |
5%
|
|
| 2012 | 3 |
7.5%
|
|
| 2013 | 2 |
5%
|
|
| 9998 | don't know | 6 |
15%
|
| Sysmiss | 16390 |