Year | Value | 2021 | 83.266124334261 | 2020 | 83.317873503723 | 2019 | 84.109062287338 | 2018 | 83.85312921332 | 2017 | 83.748355018232 | 2016 | 83.863289277563 | 2015 | 83.458983003973 | 2014 | 83.848332058526 | 2013 | 83.455648123234 | 2012 | 83.203012234705 | 2011 | 83.271408266657 | 2010 | 82.753303568263 | 2009 | 82.503003048609 | 2008 | 82.285003370459 | 2007 | 82.130630872752 | 2006 | 81.943621530743 | 2005 | 81.547780197342 | 2004 | 81.416228807095 | 2003 | 80.875943254473 | 2002 | 80.891044167717 | 2001 | 80.815820091304 | 2000 | 80.516859947919 | 1999 | 80.242202131119 | 1998 | 80.042170470973 | 1997 | 79.814967632524 | 1996 | 79.553294284772 | 1995 | 79.367452887519 | 1994 | 79.225146446394 | 1993 | 78.942503495632 | 1992 | 78.855817650837 | 1991 | 78.523179513175 | 1990 | 78.369656153342 | 1989 | 78.292274533161 | 1988 | 78.115645250091 | 1987 | 77.912272578632 | 1986 | 77.622938729107 | 1985 | 77.393558619187 | 1984 | 77.328797534269 | 1983 | 77.006599352192 | 1982 | 76.942254110231 | 1981 | 76.671320476469 | 1980 | 76.340240216091 | 1979 | 76.286075965256 | 1978 | 75.971939316806 | 1977 | 75.854430125634 | 1976 | 75.458405813562 | 1975 | 75.151147703832 | 1974 | 75.071089927142 | 1973 | 74.727063706013 | 1972 | 74.583070045871 | 1971 | 74.196586041894 | 1970 | 73.97861460435 | 1969 | 73.561509782336 | 1968 | 73.654931379241 | 1967 | 73.60362602861 | 1966 | 73.534924333339 | 1965 | 73.174832190508 | 1964 | 73.050427673533 | 1963 | 72.476380105612 | 1962 | 72.070813471939 | 1961 | 72.169456965939 | 1960 | 71.72010822981 |
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