Year | Value | 2021 | 35.660613508266 | 2020 | 34.67231302727 | 2019 | 26.52660503041 | 2018 | 25.729000957606 | 2017 | 24.748339512007 | 2016 | 23.706256434241 | 2015 | 22.865554469277 | 2014 | 19.56538960172 | 2013 | 18.394420383534 | 2012 | 19.216659458765 | 2011 | 20.720216572413 | 2010 | 23.681791339694 | 2009 | 26.40086587536 | 2008 | 26.076322347553 | 2007 | 28.528818392683 | 2006 | 32.539457543631 | 1994 | 55.491534708204 | 1993 | 70.616098454412 | 1992 | 80.142729037233 | 1991 | 78.216751206391 | 1990 | 189.24628555764 |
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