Year | Value | 2021 | 0.059 | 2020 | 0.081 | 2019 | 0.076 | 2018 | 0.076 | 2017 | 0.074 | 2016 | 0.045 | 2015 | 0.048 | 2010 | 0.0506 | 2008 | 0.056 | 2007 | 0.048 | 2004 | 0.044 | 2001 | 0.057 | 1995 | 0.076 | 1994 | 0.056 | 1991 | 0.088 | 1986 | 0.085 | 1984 | 0.117 | 1981 | 0.049 | 1980 | 0.055 | 1975 | 0.035 | 1970 | 0.035 | 1965 | 0.043 | 1960 | 0.021 |
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