| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 75 |
100%
|
| 1972 | 0 | ||
| 1974 | 0 | ||
| 1985 | 0 | ||
| 1986 | 0 | ||
| 1991 | 0 | ||
| 2000 | 0 | ||
| 2002 | 0 | ||
| 2004 | 0 | ||
| 2005 | 0 | ||
| 2006 | 0 | ||
| 2007 | 0 | ||
| 2008 | 0 | ||
| 2009 | 0 | ||
| 2010 | 0 | ||
| 2011 | 0 | ||
| 2012 | 0 | ||
| 2014 | 0 | ||
| 2015 | 0 | ||
| 2016 | 0 | ||
| 2017 | 0 | ||
| 2018 | 0 | ||
| 2019 | 0 | ||
| 2020 | 0 | ||
| 2021 | 0 |