| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 1 |
0%
|
|
| 1971 | 1 |
0%
|
|
| 1972 | 5 |
0%
|
|
| 1973 | 13 |
0%
|
|
| 1974 | 24 |
0.1%
|
|
| 1975 | 52 |
0.2%
|
|
| 1976 | 99 |
0.3%
|
|
| 1977 | 130 |
0.4%
|
|
| 1978 | 214 |
0.7%
|
|
| 1979 | 306 |
1%
|
|
| 1980 | 430 |
1.4%
|
|
| 1981 | 542 |
1.7%
|
|
| 1982 | 628 |
2%
|
|
| 1983 | 721 |
2.3%
|
|
| 1984 | 839 |
2.7%
|
|
| 1985 | 888 |
2.8%
|
|
| 1986 | 930 |
3%
|
|
| 1987 | 944 |
3%
|
|
| 1988 | 994 |
3.2%
|
|
| 1989 | 1066 |
3.4%
|
|
| 1990 | 1107 |
3.5%
|
|
| 1991 | 1247 |
4%
|
|
| 1992 | 1158 |
3.7%
|
|
| 1993 | 1270 |
4%
|
|
| 1994 | 1275 |
4.1%
|
|
| 1995 | 1275 |
4.1%
|
|
| 1996 | 1310 |
4.2%
|
|
| 1997 | 1261 |
4%
|
|
| 1998 | 1290 |
4.1%
|
|
| 1999 | 1229 |
3.9%
|
|
| 2000 | 1376 |
4.4%
|
|
| 2001 | 1366 |
4.3%
|
|
| 2002 | 1358 |
4.3%
|
|
| 2003 | 1391 |
4.4%
|
|
| 2004 | 1522 |
4.8%
|
|
| 2005 | 1480 |
4.7%
|
|
| 2006 | 1357 |
4.3%
|
|
| 2007 | 321 |
1%
|
|
| 9997 | 6 |
0%
|
|
| 9998 | 5 |
0%
|
|
| 9999 | 36 |
0.1%
|