| Year | Value | | 2024 | 10.700213382231 | | 2023 | 12.072943001922 | | 2022 | 42.321957501476 | | 2021 | 42.874298582044 | | 2020 | 44.014631924733 | | 2019 | 46.141645008917 | | 2018 | 13.925526447891 | | 2017 | 8.4171705151845 | | 2016 | -1.2235279622608 | | 2015 | 0.99101813796728 | | 2014 | 1.5214394640905 | | 2013 | 0.49351388019762 | | 2012 | -6.7503509601155 | | 2011 | 4.7782544408166 | | 2010 | 1.5068497521511 | | 2009 | -1.8496436994787 | | 1994 | -5.286089194548 | | 1993 | 0.15389981354777 | | 1992 | -11.586055782218 | | 1991 | -5.6738229351567 | | 1990 | -1.222927762774 | | 1989 | 0.90754224990599 | | 1988 | 3.0907590147473 | | 1987 | -1.9011874828964 | | 1986 | 2.1968414325609 | | 1985 | 4.1795496868967 | | 1984 | 5.6635601865252 | | 1983 | -7.7494182223558 | | 1982 | -5.4717448854685 | | 1981 | 2.1806678875949 | | 1980 | -1.6199566049636 | | 1979 | -1.253056624756 | | 1978 | 3.0273912792442 | | 1977 | 6.9608669169274 |
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