| Year | Value | | 2021 | 65.93980141 | | 2020 | 62.08563779 | | 2019 | 56.80248377 | | 2018 | 53.8 | | 2017 | 48.94517397 | | 2016 | 45.4 | | 2015 | 42.76382778 | | 2014 | 40.08 | | 2013 | 37.4 | | 2012 | 34.6812 | | 2011 | 32 | | 2010 | 31.59 | | 2009 | 31.36 | | 2008 | 21.06 | | 2007 | 14.11 | | 2006 | 9.499626942 | | 2005 | 6.403086288 | | 2004 | 6.076047814 | | 2003 | 4.719875395 | | 2002 | 4.161568745 | | 2001 | 3.064448389 | | 2000 | 2.506411052 | | 1999 | 1.891871357 | | 1998 | 1.670148436 | | 1997 | 1.003086936 | | 1996 | 0.226306297 | | 1995 | 0.114720735 |
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