| Year | Value | | 2021 | 28.1699 | | 2020 | 14.0479 | | 2019 | 75.617661 | | 2018 | 75.26435 | | 2017 | 53.792982 | | 2016 | 40.459830355 | | 2015 | 37.7408652 | | 2014 | 22.0855 | | 2013 | 14.3835 | | 2012 | 75.783937741553 | | 2011 | 80.920084545455 | | 2010 | 69.320238864 | | 2009 | 63.231 | | 2008 | 63.359 | | 2007 | 18.012 | | 2006 | 43.762 | | 2005 | 39.293 | | 2004 | 23.734 | | 2003 | 18.359 | | 2002 | 11.284 | | 2001 | 11.522 | | 2000 | 12.195 | | 1999 | 13.1999998093 | | 1998 | 27.3999996185 | | 1997 | 11.8000001907 | | 1996 | 16.5 | | 1995 | 23 | | 1994 | 20.8999996185 | | 1993 | 7.6999998093 | | 1992 | 32.7000007629 |
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