| Value | Category | Cases | |
|---|---|---|---|
| -9 | DON'T KNOW (SPONTANEOUS) | 21 |
0.2%
|
| 1863 | 1 |
0%
|
|
| 1873 | 1 |
0%
|
|
| 1882 | 1 |
0%
|
|
| 1915 | 2 |
0%
|
|
| 1917 | 3 |
0%
|
|
| 1919 | 1 |
0%
|
|
| 1927 | 2 |
0%
|
|
| 1930 | 25 |
0.3%
|
|
| 1931 | 5 |
0.1%
|
|
| 1932 | 3 |
0%
|
|
| 1933 | 3 |
0%
|
|
| 1934 | 2 |
0%
|
|
| 1935 | 6 |
0.1%
|
|
| 1936 | 2 |
0%
|
|
| 1937 | 5 |
0.1%
|
|
| 1938 | 2 |
0%
|
|
| 1940 | 5 |
0.1%
|
|
| 1941 | 3 |
0%
|
|
| 1942 | 1 |
0%
|
|
| 1943 | 6 |
0.1%
|
|
| 1944 | 2 |
0%
|
|
| 1945 | 7 |
0.1%
|
|
| 1946 | 6 |
0.1%
|
|
| 1947 | 12 |
0.1%
|
|
| 1948 | 8 |
0.1%
|
|
| 1949 | 5 |
0.1%
|
|
| 1950 | 12 |
0.1%
|
|
| 1951 | 6 |
0.1%
|
|
| 1952 | 20 |
0.2%
|
|
| 1953 | 6 |
0.1%
|
|
| 1954 | 10 |
0.1%
|
|
| 1955 | 10 |
0.1%
|
|
| 1956 | 18 |
0.2%
|
|
| 1957 | 17 |
0.2%
|
|
| 1958 | 16 |
0.2%
|
|
| 1959 | 15 |
0.2%
|
|
| 1960 | 42 |
0.5%
|
|
| 1961 | 24 |
0.3%
|
|
| 1962 | 29 |
0.3%
|
|
| 1963 | 18 |
0.2%
|
|
| 1964 | 45 |
0.5%
|
|
| 1965 | 44 |
0.5%
|
|
| 1966 | 22 |
0.2%
|
|
| 1967 | 40 |
0.4%
|
|
| 1968 | 37 |
0.4%
|
|
| 1969 | 38 |
0.4%
|
|
| 1970 | 56 |
0.6%
|
|
| 1971 | 40 |
0.4%
|
|
| 1972 | 63 |
0.7%
|
|
| 1973 | 50 |
0.5%
|
|
| 1974 | 72 |
0.8%
|
|
| 1975 | 61 |
0.7%
|
|
| 1976 | 73 |
0.8%
|
|
| 1977 | 40 |
0.4%
|
|
| 1978 | 96 |
1%
|
|
| 1979 | 81 |
0.9%
|
|
| 1980 | 169 |
1.8%
|
|
| 1981 | 88 |
0.9%
|
|
| 1982 | 103 |
1.1%
|
|
| 1983 | 116 |
1.2%
|
|
| 1984 | 139 |
1.5%
|
|
| 1985 | 182 |
2%
|
|
| 1986 | 121 |
1.3%
|
|
| 1987 | 113 |
1.2%
|
|
| 1988 | 125 |
1.3%
|
|
| 1989 | 163 |
1.8%
|
|
| 1990 | 268 |
2.9%
|
|
| 1991 | 164 |
1.8%
|
|
| 1992 | 202 |
2.2%
|
|
| 1993 | 194 |
2.1%
|
|
| 1994 | 220 |
2.4%
|
|
| 1995 | 307 |
3.3%
|
|
| 1996 | 237 |
2.6%
|
|
| 1997 | 225 |
2.4%
|
|
| 1998 | 411 |
4.4%
|
|
| 1999 | 247 |
2.7%
|
|
| 2000 | 398 |
4.3%
|
|
| 2001 | 354 |
3.8%
|
|
| 2002 | 321 |
3.5%
|
|
| 2003 | 408 |
4.4%
|
|
| 2004 | 386 |
4.2%
|
|
| 2005 | 405 |
4.4%
|
|
| 2006 | 410 |
4.4%
|
|
| 2007 | 353 |
3.8%
|
|
| 2008 | 326 |
3.5%
|
|
| 2009 | 269 |
2.9%
|
|
| 2010 | 295 |
3.2%
|
|
| 2011 | 190 |
2%
|
|
| 2012 | 91 |
1%
|
|
| 2013 | 40 |
0.4%
|
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