| Value | Category | Cases | |
|---|---|---|---|
| 1971 | 1 |
0%
|
|
| 1972 | 1 |
0%
|
|
| 1973 | 3 |
0%
|
|
| 1974 | 7 |
0.1%
|
|
| 1975 | 20 |
0.2%
|
|
| 1976 | 21 |
0.2%
|
|
| 1977 | 26 |
0.2%
|
|
| 1978 | 47 |
0.4%
|
|
| 1979 | 43 |
0.3%
|
|
| 1980 | 77 |
0.6%
|
|
| 1981 | 75 |
0.6%
|
|
| 1982 | 106 |
0.8%
|
|
| 1983 | 99 |
0.8%
|
|
| 1984 | 143 |
1.1%
|
|
| 1985 | 253 |
2%
|
|
| 1986 | 167 |
1.3%
|
|
| 1987 | 216 |
1.7%
|
|
| 1988 | 224 |
1.7%
|
|
| 1989 | 259 |
2%
|
|
| 1990 | 370 |
2.9%
|
|
| 1991 | 310 |
2.4%
|
|
| 1992 | 335 |
2.6%
|
|
| 1993 | 336 |
2.6%
|
|
| 1994 | 321 |
2.5%
|
|
| 1995 | 441 |
3.4%
|
|
| 1996 | 353 |
2.7%
|
|
| 1997 | 409 |
3.2%
|
|
| 1998 | 451 |
3.5%
|
|
| 1999 | 381 |
3%
|
|
| 2000 | 547 |
4.2%
|
|
| 2001 | 368 |
2.8%
|
|
| 2002 | 440 |
3.4%
|
|
| 2003 | 390 |
3%
|
|
| 2004 | 387 |
3%
|
|
| 2005 | 475 |
3.7%
|
|
| 2006 | 422 |
3.3%
|
|
| 2007 | 445 |
3.4%
|
|
| 2008 | 488 |
3.8%
|
|
| 2009 | 426 |
3.3%
|
|
| 2010 | 505 |
3.9%
|
|
| 2011 | 432 |
3.3%
|
|
| 2012 | 441 |
3.4%
|
|
| 2013 | 470 |
3.6%
|
|
| 2014 | 516 |
4%
|
|
| 2015 | 293 |
2.3%
|
|
| 2016 | 9 |
0.1%
|
|
| 9998 | don't know | 366 |
2.8%
|