| Year | Value | | 2022 | 0.06918422459349 | | 2021 | 0.11013366227089 | | 2020 | 0.17175466098088 | | 2019 | 0.082073032034607 | | 2018 | 0.088093538876023 | | 2017 | 0.049269486900483 | | 2016 | 0.048224998318759 | | 2015 | 0.052203699698296 | | 2014 | 0.035932539081504 | | 2013 | 0.034893292180305 | | 1995 | 0.10621012335176 | | 1994 | 0.077784781484355 | | 1993 | 0.10632602794812 | | 1992 | 0.11378328894807 | | 1991 | 0.1115503875969 | | 1990 | 0.10217324762779 | | 1989 | 0.089119408945687 | | 1988 | 0.088607367475292 |
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