| Value | Category | Cases | |
|---|---|---|---|
| 1981 | 1 |
2.1%
|
|
| 1986 | 1 |
2.1%
|
|
| 1987 | 2 |
4.3%
|
|
| 1988 | 1 |
2.1%
|
|
| 1992 | 2 |
4.3%
|
|
| 1993 | 1 |
2.1%
|
|
| 1995 | 1 |
2.1%
|
|
| 1999 | 2 |
4.3%
|
|
| 2000 | 3 |
6.4%
|
|
| 2001 | 1 |
2.1%
|
|
| 2002 | 4 |
8.5%
|
|
| 2004 | 1 |
2.1%
|
|
| 2005 | 3 |
6.4%
|
|
| 2006 | 1 |
2.1%
|
|
| 2007 | 1 |
2.1%
|
|
| 2008 | 1 |
2.1%
|
|
| 2009 | 2 |
4.3%
|
|
| 2012 | 2 |
4.3%
|
|
| 2013 | 3 |
6.4%
|
|
| 2014 | 1 |
2.1%
|
|
| 2015 | 3 |
6.4%
|
|
| 2016 | 1 |
2.1%
|
|
| 2017 | 1 |
2.1%
|
|
| 2019 | 2 |
4.3%
|
|
| 2020 | 2 |
4.3%
|
|
| 2021 | 2 |
4.3%
|
|
| 2024 | 1 |
2.1%
|
|
| 9998 | Don't know | 1 |
2.1%
|
| Sysmiss | 41965 |