| Year | Value | | 2022 | 84.54009378 | | 2021 | 82.67062427 | | 2020 | 81.33889705 | | 2019 | 80.86694441 | | 2018 | 80.68816754 | | 2017 | 78.71917285 | | 2016 | 76.4811987 | | 2015 | 75.6688387 | | 2014 | 74.23171164 | | 2013 | 74.1104 | | 2012 | 73.43000782 | | 2011 | 70.49 | | 2010 | 68.82 | | 2009 | 64.43 | | 2008 | 62.97 | | 2007 | 51.93 | | 2006 | 47.93 | | 2005 | 35.27 | | 2004 | 35.5 | | 2003 | 34.3 | | 2002 | 23.93 | | 2001 | 14.69717212 | | 2000 | 9.780527888 | | 1999 | 6.832802018 | | 1998 | 3.895906065 | | 1997 | 2.915698695 | | 1996 | 1.940378193 | | 1995 | 1.45357584 | | 1994 | 1.259217838 | | 1993 | 0.581319529 |
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