| Value | Category | Cases | |
|---|---|---|---|
| 1987 | 3 |
0%
|
|
| 1988 | 16 |
0.2%
|
|
| 1989 | 24 |
0.3%
|
|
| 1990 | 44 |
0.5%
|
|
| 1991 | 83 |
1%
|
|
| 1992 | 79 |
0.9%
|
|
| 1993 | 125 |
1.5%
|
|
| 1994 | 146 |
1.7%
|
|
| 1995 | 204 |
2.4%
|
|
| 1996 | 217 |
2.5%
|
|
| 1997 | 225 |
2.6%
|
|
| 1998 | 279 |
3.3%
|
|
| 1999 | 265 |
3.1%
|
|
| 2000 | 390 |
4.6%
|
|
| 2001 | 360 |
4.2%
|
|
| 2002 | 380 |
4.4%
|
|
| 2003 | 331 |
3.9%
|
|
| 2004 | 317 |
3.7%
|
|
| 2005 | 361 |
4.2%
|
|
| 2006 | 334 |
3.9%
|
|
| 2007 | 335 |
3.9%
|
|
| 2008 | 325 |
3.8%
|
|
| 2009 | 345 |
4%
|
|
| 2010 | 346 |
4%
|
|
| 2011 | 330 |
3.9%
|
|
| 2012 | 348 |
4.1%
|
|
| 2013 | 372 |
4.3%
|
|
| 2014 | 365 |
4.3%
|
|
| 2015 | 326 |
3.8%
|
|
| 2016 | 313 |
3.7%
|
|
| 2017 | 309 |
3.6%
|
|
| 2018 | 310 |
3.6%
|
|
| 2019 | 335 |
3.9%
|
|
| 2020 | 7 |
0.1%
|
|
| 9997 | INCONSISTENT | 4 |
0%
|
| 9999 | NO RESPONSE | 3 |
0%
|