| Year | Value | | 2021 | 0.000290479 | | 2020 | 1.636713284 | | 2019 | 6.900144 | | 2018 | 26.293869 | | 2017 | 22.206886 | | 2016 | 21.084889 | | 2015 | 30.302405 | | 2014 | 34.36805 | | 2013 | 0.677064 | | 2012 | 0.88838849653504 | | 2011 | 0.692604 | | 2010 | 0.484 | | 2004 | 56.479 | | 2003 | 45.675 | | 2002 | 21.059 | | 2001 | 74.744 | | 2000 | 76.007 | | 1999 | 36.7000007629 | | 1997 | 35.2999992371 | | 1996 | 28.7000007629 | | 1995 | 27.2999992371 | | 1994 | 25.3999996185 | | 1993 | 21.7999992371 | | 1992 | 11.1000003815 | | 1991 | 2 |
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