Year | Value | 2021 | 0.065 | 2020 | 0.07 | 2018 | 0.094 | 2017 | 0.097 | 2015 | 0.047 | 2014 | 0.058 | 2013 | 0.055 | 2012 | 0.051 | 2011 | 0.038 | 2010 | 0.046 | 2004 | 0.028 | 2000 | 0.052 | 1995 | 0.055 | 1993 | 0.056 | 1991 | 0.059 | 1990 | 0.058 | 1986 | 0.058 | 1984 | 0.047 | 1975 | 0.012 | 1970 | 0.017 | 1965 | 0.017 | 1960 | 0.01 |
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