| Year | Value | | 2024 | 64.900307452351 | | 2023 | 62.473132206925 | | 2022 | 59.944018464086 | | 2021 | 68.779571372348 | | 2020 | 74.554407379152 | | 2019 | 53.362324691396 | | 2018 | 53.151535645658 | | 2017 | 54.462565184914 | | 2016 | 56.023624399109 | | 2015 | 55.991583778879 | | 2014 | 51.482708129793 | | 2013 | 53.200869076551 | | 2012 | 55.725164937705 | | 2011 | 54.119385839173 | | 2010 | 53.149732960555 | | 2009 | 53.1924466727 | | 2008 | 45.320511273114 | | 2007 | 39.15856394914 | | 2006 | 43.291678192993 | | 2005 | 46.061651424162 | | 2004 | 46.800985832403 | | 2003 | 51.271337055745 | | 2002 | 54.149119492798 | | 2001 | 57.458356450436 | | 2000 | 58.737974238357 | | 1999 | 66.245831750035 | | 1998 | 72.48279975631 | | 1997 | 74.928409573324 | | 1996 | 78.038667928926 | | 1995 | 77.312621975635 | | 1994 | 75.943846499624 | | 1993 | 75.187708239351 | | 1992 | 70.702052792455 | | 1991 | 67.444743528178 | | 1990 | 61.762240456879 |
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