| Year | Value | | 2022 | 43.32274013058 | | 2021 | 55.38443197939 | | 2020 | 65.884413102242 | | 2019 | 45.15350593118 | | 2018 | 38.887742884433 | | 2017 | 39.392467420317 | | 2016 | 40.268724187967 | | 2015 | 36.650655665242 | | 2014 | 30.97609561753 | | 2013 | 29.499424686375 | | 2012 | 28.796098033959 | | 2011 | 28.371541719161 | | 2010 | 31.892253546944 | | 2009 | 30.856777493606 | | 2008 | 23.47325542991 | | 2007 | 19.204062658146 | | 2006 | 23.090087672862 | | 2005 | 29.229233536129 | | 2004 | 36.915607218835 | | 2003 | 45.507408834554 | | 2002 | 55.449302575107 | | 2001 | 56.032364399161 | | 2000 | 58.519633962701 | | 1999 | 60.77760333057 | | 1998 | 56.906473387627 | | 1997 | 45.902215196821 | | 1996 | 46.40299857826 | | 1995 | 61.051634865257 |
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