Year | Value | 2021 | 48.955278643504 | 2020 | 46.431596642338 | 2019 | 39.969480137044 | 2018 | 37.555643179394 | 2017 | 37.348635137548 | 2016 | 38.065514156892 | 2015 | 37.492957109714 | 2014 | 36.500264021551 | 2013 | 34.929859301497 | 2012 | 32.409020579936 | 1997 | 8.6798604727881 | 1996 | 6.8629801840029 | 1995 | 7.2168897692572 | 1994 | 8.1789368617001 | 1993 | 9.2004189334837 | 1992 | 9.9938459498567 | 1991 | 10.242860165184 | 1990 | 7.4428015688371 |
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