| Value | Category | Cases | |
|---|---|---|---|
| 1971 | 1 |
0%
|
|
| 1974 | 1 |
0%
|
|
| 1977 | 6 |
0.1%
|
|
| 1978 | 6 |
0.1%
|
|
| 1979 | 9 |
0.1%
|
|
| 1980 | 28 |
0.3%
|
|
| 1981 | 47 |
0.5%
|
|
| 1982 | 56 |
0.5%
|
|
| 1983 | 88 |
0.9%
|
|
| 1984 | 103 |
1%
|
|
| 1985 | 131 |
1.3%
|
|
| 1986 | 180 |
1.8%
|
|
| 1987 | 196 |
1.9%
|
|
| 1988 | 270 |
2.6%
|
|
| 1989 | 297 |
2.9%
|
|
| 1990 | 376 |
3.7%
|
|
| 1991 | 355 |
3.5%
|
|
| 1992 | 376 |
3.7%
|
|
| 1993 | 402 |
3.9%
|
|
| 1994 | 419 |
4.1%
|
|
| 1995 | 436 |
4.2%
|
|
| 1996 | 417 |
4.1%
|
|
| 1997 | 422 |
4.1%
|
|
| 1998 | 451 |
4.4%
|
|
| 1999 | 417 |
4.1%
|
|
| 2000 | 462 |
4.5%
|
|
| 2001 | 426 |
4.2%
|
|
| 2002 | 410 |
4%
|
|
| 2003 | 418 |
4.1%
|
|
| 2004 | 441 |
4.3%
|
|
| 2005 | 431 |
4.2%
|
|
| 2006 | 425 |
4.1%
|
|
| 2007 | 349 |
3.4%
|
|
| 2008 | 416 |
4.1%
|
|
| 2009 | 437 |
4.3%
|
|
| 2010 | 401 |
3.9%
|
|
| 2011 | 146 |
1.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 11 |
0.1%
|
| 9999 | Missing | 0 |
0%
|