| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 3 |
0%
|
|
| 1971 | 6 |
0.1%
|
|
| 1972 | 15 |
0.1%
|
|
| 1973 | 32 |
0.3%
|
|
| 1974 | 57 |
0.5%
|
|
| 1975 | 73 |
0.7%
|
|
| 1976 | 81 |
0.7%
|
|
| 1977 | 105 |
0.9%
|
|
| 1978 | 125 |
1.1%
|
|
| 1979 | 157 |
1.4%
|
|
| 1980 | 208 |
1.9%
|
|
| 1981 | 163 |
1.5%
|
|
| 1982 | 179 |
1.6%
|
|
| 1983 | 221 |
2%
|
|
| 1984 | 234 |
2.1%
|
|
| 1985 | 240 |
2.2%
|
|
| 1986 | 242 |
2.2%
|
|
| 1987 | 251 |
2.2%
|
|
| 1988 | 332 |
3%
|
|
| 1989 | 409 |
3.7%
|
|
| 1990 | 448 |
4%
|
|
| 1991 | 431 |
3.9%
|
|
| 1992 | 351 |
3.1%
|
|
| 1993 | 396 |
3.5%
|
|
| 1994 | 357 |
3.2%
|
|
| 1995 | 344 |
3.1%
|
|
| 1996 | 355 |
3.2%
|
|
| 1997 | 364 |
3.3%
|
|
| 1998 | 379 |
3.4%
|
|
| 1999 | 391 |
3.5%
|
|
| 2000 | 407 |
3.6%
|
|
| 2001 | 436 |
3.9%
|
|
| 2002 | 399 |
3.6%
|
|
| 2003 | 371 |
3.3%
|
|
| 2004 | 391 |
3.5%
|
|
| 2005 | 393 |
3.5%
|
|
| 2006 | 452 |
4.1%
|
|
| 2007 | 418 |
3.7%
|
|
| 2008 | 411 |
3.7%
|
|
| 2009 | 326 |
2.9%
|
|
| 2010 | 193 |
1.7%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 11 |
0.1%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 1165 |