| Value | Category | Cases | |
|---|---|---|---|
| 0 | 954 |
87.6%
|
|
| 1987 | 1 |
0.1%
|
|
| 1999 | 1 |
0.1%
|
|
| 2000 | 1 |
0.1%
|
|
| 2001 | 1 |
0.1%
|
|
| 2003 | 1 |
0.1%
|
|
| 2004 | 1 |
0.1%
|
|
| 2005 | 1 |
0.1%
|
|
| 2006 | 3 |
0.3%
|
|
| 2007 | 3 |
0.3%
|
|
| 2008 | 3 |
0.3%
|
|
| 2009 | 1 |
0.1%
|
|
| 2010 | 1 |
0.1%
|
|
| 2012 | 2 |
0.2%
|
|
| 2013 | 3 |
0.3%
|
|
| 2014 | 8 |
0.7%
|
|
| 2015 | 18 |
1.7%
|
|
| 2016 | 25 |
2.3%
|
|
| 2017 | 50 |
4.6%
|
|
| 2018 | 11 |
1%
|
|
| Sysmiss | 1549 |