| Value | Category | Cases | |
|---|---|---|---|
| 0 | 274 |
69.7%
|
|
| 1990 | 1 |
0.3%
|
|
| 2004 | 1 |
0.3%
|
|
| 2009 | 1 |
0.3%
|
|
| 2010 | 1 |
0.3%
|
|
| 2013 | 1 |
0.3%
|
|
| 2014 | 2 |
0.5%
|
|
| 2015 | 5 |
1.3%
|
|
| 2016 | 3 |
0.8%
|
|
| 2017 | 4 |
1%
|
|
| 2018 | 7 |
1.8%
|
|
| 2019 | 1 |
0.3%
|
|
| 9999 | 92 |
23.4%
|
|
| Sysmiss | 2 |