Year | Value | 2021 | 73.333386469672 | 2020 | 73.671110086411 | 2019 | 74.02571790956 | 2018 | 73.780036542602 | 2017 | 73.333953133236 | 2016 | 73.268306016663 | 2015 | 73.060288599458 | 2014 | 72.839152527511 | 2013 | 72.568587222755 | 2012 | 72.252192405648 | 2011 | 71.987967822633 | 2010 | 71.651771307087 | 2009 | 71.361151877312 | 2008 | 70.946144701151 | 2007 | 70.734155707605 | 2006 | 70.453985074449 | 2005 | 70.002410106883 | 2004 | 69.617227852461 | 2003 | 69.317693975053 | 2002 | 68.91471564198 | 2001 | 68.612014486906 | 2000 | 68.241273783986 | 1999 | 68.029260029888 | 1998 | 67.746628341584 | 1997 | 67.394527077122 | 1996 | 66.932910737369 | 1995 | 66.519425022353 | 1994 | 66.272612378987 | 1993 | 66.063854095818 | 1992 | 65.961389928789 | 1991 | 65.675900382169 | 1990 | 65.384764756028 | 1989 | 65.259277585197 | 1988 | 65.058935907392 | 1987 | 64.855613174045 | 1986 | 64.571894539626 | 1985 | 64.086775731711 | 1984 | 63.729317412618 | 1983 | 63.41892712012 | 1982 | 63.055892822319 | 1981 | 62.626502131641 | 1980 | 62.121642123163 | 1979 | 61.672529548097 | 1978 | 61.196793570205 | 1977 | 60.693933199436 | 1976 | 60.135371776744 | 1975 | 59.496838378609 | 1974 | 58.79184932355 | 1973 | 58.319610049124 | 1972 | 57.510716141401 | 1971 | 57.030799902623 | 1970 | 56.287554517408 | 1969 | 55.551993901771 | 1968 | 55.080856412856 | 1967 | 54.733153754986 | 1966 | 54.299778816068 | 1965 | 53.77563275759 | 1964 | 53.330992698125 | 1963 | 52.673878357238 | 1962 | 52.198294686587 | 1961 | 46.099816823425 | 1960 | 41.539846554797 |
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