| Year | Value | | 2021 | 0.037413 | | 2020 | 0.015399 | | 2019 | 0.043615 | | 2018 | 0.056064 | | 2000 | 0.257 | | 1999 | 0.200000003 | | 1998 | 0.1000000015 | | 1997 | 0.1000000015 | | 1996 | 0.1000000015 | | 1995 | 0.1000000015 | | 1994 | 0.200000003 | | 1993 | 0.200000003 | | 1992 | 0.200000003 | | 1991 | 0.1000000015 | | 1990 | 0.200000003 | | 1989 | 0.200000003 | | 1988 | 0.200000003 | | 1987 | 0.200000003 | | 1986 | 0.200000003 | | 1985 | 0.200000003 | | 1984 | 0.1000000015 | | 1983 | 0.1000000015 | | 1982 | 0.1000000015 | | 1981 | 0.1000000015 | | 1980 | 0.1000000015 | | 1979 | 0.1000000015 | | 1978 | 0.1000000015 |
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