Year | Value | 2021 | 72.147434334031 | 2020 | 73.038474170549 | 2019 | 75.038349469931 | 2018 | 74.851498782309 | 2017 | 74.733493500988 | 2016 | 74.579232875422 | 2015 | 74.611969582058 | 2014 | 74.550647700928 | 2013 | 74.346485387839 | 2012 | 74.097342701693 | 2011 | 73.871544440234 | 2010 | 73.385642956432 | 2009 | 73.491957016681 | 2008 | 73.287827212867 | 2007 | 73.065685323292 | 2006 | 72.924212680645 | 2005 | 72.714639223226 | 2004 | 72.343865150839 | 2003 | 72.021549335684 | 2002 | 71.836842019942 | 2001 | 71.487118219397 | 2000 | 71.228436272106 | 1999 | 70.911354646866 | 1998 | 70.506529557527 | 1997 | 70.252642440175 | 1996 | 69.892294903988 | 1995 | 69.518530732019 | 1994 | 69.208141765173 | 1993 | 68.831390569668 | 1992 | 68.505850223006 | 1991 | 68.177442032764 | 1990 | 67.824201708992 | 1989 | 67.538923442435 | 1988 | 67.201058983067 | 1987 | 66.793483456267 | 1986 | 66.373518208927 | 1985 | 65.78107982716 | 1984 | 65.464183899058 | 1983 | 65.053418746783 | 1982 | 64.505757346719 | 1981 | 64.173506200242 | 1980 | 63.686163178807 | 1979 | 63.261446681726 | 1978 | 62.914841727693 | 1977 | 62.546730832096 | 1976 | 61.983541635662 | 1975 | 61.747581846198 | 1974 | 61.217278517457 | 1973 | 60.797687636375 | 1972 | 60.251600215311 | 1971 | 59.884947165296 | 1970 | 59.073600522095 | 1969 | 59.001288524107 | 1968 | 58.649825998075 | 1967 | 58.272956229219 | 1966 | 57.886118110536 | 1965 | 57.470838340229 | 1964 | 57.073365881655 | 1963 | 56.565337037281 | 1962 | 56.145298719385 | 1961 | 55.69794806684 | 1960 | 55.153879035259 |
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