Year | Value | 2022 | 61.760938738141 | 2021 | 61.57642309048 | 2020 | 64.016113842067 | 2019 | 63.759031776915 | 2018 | 63.737678887377 | 2017 | 64.880512682345 | 2016 | 64.368544119053 | 2015 | 64.405707429304 | 2014 | 63.985687240058 | 2013 | 64.402347218164 | 2012 | 64.238885353412 | 2011 | 64.164007125543 | 2010 | 64.494308056549 | 2009 | 65.41465702768 | 2008 | 63.107336384229 | 2007 | 63.437414239373 | 2006 | 65.107850272008 | 2005 | 67.363605083373 | 2004 | 68.368659590677 | 2003 | 68.909641054245 | 2002 | 68.447628108823 | 2001 | 67.939307933477 | 2000 | 67.827219583844 | 1999 | 69.174712568584 | 1998 | 68.813144813425 | 1997 | 69.390825145823 | 1996 | 69.088648446617 | 1995 | 68.149059893321 | 1994 | 67.707472548935 | 1993 | 68.460847917645 | 1992 | 68.453602431544 | 1991 | 66.877659160405 | 1990 | 64.872788019706 | 1989 | 65.480345889077 | 1988 | 66.190045607301 | 1987 | 67.201325541265 | 1986 | 67.273842577097 | 1985 | 67.597071587551 | 1984 | 68.132191691523 | 1983 | 69.506927058354 | 1982 | 68.357471979423 | 1981 | 68.046045478211 | 1980 | 68.090986082259 |
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