| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 |
1.7%
|
|
| 1980 | 1 |
1.7%
|
|
| 1988 | 1 |
1.7%
|
|
| 1990 | 1 |
1.7%
|
|
| 1992 | 1 |
1.7%
|
|
| 1995 | 1 |
1.7%
|
|
| 1996 | 2 |
3.4%
|
|
| 1998 | 2 |
3.4%
|
|
| 1999 | 2 |
3.4%
|
|
| 2000 | 4 |
6.8%
|
|
| 2001 | 2 |
3.4%
|
|
| 2002 | 3 |
5.1%
|
|
| 2003 | 1 |
1.7%
|
|
| 2004 | 3 |
5.1%
|
|
| 2005 | 2 |
3.4%
|
|
| 2006 | 2 |
3.4%
|
|
| 2007 | 2 |
3.4%
|
|
| 2008 | 6 |
10.2%
|
|
| 2010 | 3 |
5.1%
|
|
| 2012 | 3 |
5.1%
|
|
| 2013 | 1 |
1.7%
|
|
| 2014 | 3 |
5.1%
|
|
| 2015 | 6 |
10.2%
|
|
| 2016 | 3 |
5.1%
|
|
| 2017 | 2 |
3.4%
|
|
| 2018 | 1 |
1.7%
|
|
| Sysmiss | 2579 |