Year | Value | 2021 | 75.6998342925 | 2020 | 76.596316675066 | 2019 | 78.175311376765 | 2018 | 77.975405042568 | 2017 | 77.831136646777 | 2016 | 77.766718906079 | 2015 | 77.716388906227 | 2014 | 77.60378920434 | 2013 | 77.439551839774 | 2012 | 77.24927930274 | 2011 | 77.000527471233 | 2010 | 76.521284784581 | 2009 | 76.643384218444 | 2008 | 76.466969195761 | 2007 | 76.264414308887 | 2006 | 76.129050435054 | 2005 | 75.925415979197 | 2004 | 75.597051143146 | 2003 | 75.266107812888 | 2002 | 75.167705351733 | 2001 | 74.842432792403 | 2000 | 74.564046145635 | 1999 | 74.114490859339 | 1998 | 73.701564022169 | 1997 | 73.483968694613 | 1996 | 73.118423893323 | 1995 | 72.755081904647 | 1994 | 72.409291079414 | 1993 | 72.06638468156 | 1992 | 71.72525890406 | 1991 | 71.38499260946 | 1990 | 71.015000365717 | 1989 | 70.61802335914 | 1988 | 70.198373411833 | 1987 | 69.780527675196 | 1986 | 69.32352737696 | 1985 | 68.69483814448 | 1984 | 68.447061944036 | 1983 | 68.027687078363 | 1982 | 67.519571258562 | 1981 | 67.161630630236 | 1980 | 66.604039654531 | 1979 | 66.17554836622 | 1978 | 65.772992450861 | 1977 | 65.328695953186 | 1976 | 64.649054080405 | 1975 | 64.377469731898 | 1974 | 63.775270836105 | 1973 | 63.352957334716 | 1972 | 62.762031776982 | 1971 | 62.350752331942 | 1970 | 61.472883136512 | 1969 | 61.434785559378 | 1968 | 61.071263532052 | 1967 | 60.667076284974 | 1966 | 60.262018460196 | 1965 | 59.862765606737 | 1964 | 59.414771183578 | 1963 | 58.886897815584 | 1962 | 58.463237557367 | 1961 | 58.005865724612 | 1960 | 57.455345472035 |
|