Year | Value | 2021 | 0.867 | 2020 | 0.846 | 2019 | 0.803 | 2018 | 0.738 | 2017 | 0.892 | 2013 | 0.554 | 2012 | 0.51 | 2004 | 0.207 | 2001 | 0.052 | 1998 | 0.04 | 1997 | 0.04 | 1996 | 0.04 | 1995 | 0.04 | 1993 | 0.074 | 1992 | 0.076 | 1991 | 0.062 | 1990 | 0.051 | 1989 | 0.054 | 1988 | 0.051 | 1987 | 0.051 | 1985 | 0.034 | 1984 | 0.031 | 1980 | 0.034 | 1975 | 0.019 | 1970 | 0.019 | 1965 | 0.021 | 1960 | 0.013 |
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