| Year | Value | | 2021 | 3,173.72377 | | 2020 | 2,030.37809 | | 2019 | 1,620.43791 | | 2018 | 44.0886 | | 2017 | 61.6255 | | 2016 | 732.789755 | | 2015 | 686.94149 | | 2014 | 385.14865 | | 2013 | 17.9216 | | 2012 | 13.0443 | | 2011 | 9.5921 | | 2010 | 7.8084 | | 2009 | 7.388 | | 2008 | 12.032 | | 2007 | 11.897 | | 2006 | 15.746 | | 2005 | 11.916 | | 2004 | 34.361 | | 2003 | 67.109 | | 2002 | 75.954 | | 2001 | 65.995 | | 2000 | 47.211 | | 1999 | 58.2000007629 | | 1998 | 92.5 | | 1997 | 33 | | 1996 | 27.6000003815 | | 1995 | 34.4000015259 | | 1994 | 24.8999996185 | | 1993 | 26.8999996185 | | 1992 | 19.8999996185 |
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