Year | Value | 2021 | 70.599 | 2020 | 70.187 | 2019 | 70.713 | 2018 | 70.889 | 2017 | 69.822 | 2016 | 69.085 | 2015 | 68.498 | 2014 | 67.876 | 2013 | 67.108 | 2012 | 67.605 | 2011 | 67.339 | 2010 | 67.165 | 2009 | 66.111 | 2008 | 65.597 | 2007 | 65.417 | 2006 | 65.911 | 2005 | 66.005 | 2004 | 66.038 | 2003 | 65.648 | 2002 | 65.74 | 2001 | 65.665 | 2000 | 65.472 | 1999 | 66.394 | 1998 | 63.877 | 1997 | 61.526 | 1996 | 60.341 | 1995 | 59.905 | 1994 | 59.113 | 1993 | 58.575 | 1992 | 58.192 | 1991 | 55.217 | 1990 | 57.211 | 1989 | 56.135 | 1988 | 55.62 | 1987 | 55.516 | 1986 | 55.152 | 1985 | 54.439 | 1984 | 54.331 | 1983 | 53.961 | 1982 | 53.518 | 1981 | 53.215 | 1980 | 52.848 | 1979 | 52.586 | 1978 | 52.354 | 1977 | 52.21 | 1976 | 51.894 | 1975 | 51.245 | 1974 | 50.184 | 1973 | 50.793 | 1972 | 50.594 | 1971 | 22.302 | 1970 | 44.485 | 1969 | 50.066 | 1968 | 49.982 | 1967 | 49.707 | 1966 | 49.453 | 1965 | 47.858 | 1964 | 48.52 | 1963 | 47.5 | 1962 | 47.226 | 1961 | 46.083 | 1960 | 45.121 |
|