| Value | Category | Cases | |
|---|---|---|---|
| 0 | 2 |
0.8%
|
|
| 999 | 1 |
0.4%
|
|
| 1960 | 2 |
0.8%
|
|
| 1980 | 4 |
1.5%
|
|
| 1987 | 1 |
0.4%
|
|
| 1988 | 1 |
0.4%
|
|
| 1989 | 1 |
0.4%
|
|
| 1990 | 5 |
1.9%
|
|
| 1997 | 2 |
0.8%
|
|
| 1998 | 1 |
0.4%
|
|
| 1999 | 1 |
0.4%
|
|
| 2000 | 7 |
2.7%
|
|
| 2001 | 1 |
0.4%
|
|
| 2002 | 2 |
0.8%
|
|
| 2003 | 1 |
0.4%
|
|
| 2005 | 1 |
0.4%
|
|
| 2008 | 1 |
0.4%
|
|
| 2009 | 93 |
35.8%
|
|
| 2010 | 43 |
16.5%
|
|
| 2011 | 17 |
6.5%
|
|
| 2012 | 22 |
8.5%
|
|
| 2013 | 42 |
16.2%
|
|
| 2014 | 9 |
3.5%
|
|
| Sysmiss | 2544 |