Year | Value | 2021 | 2.906 | 2020 | 3.254 | 2019 | 2.194 | 2018 | 2.052 | 2017 | 1.914 | 2016 | 1.811 | 2015 | 1.761 | 2014 | 1.695 | 2013 | 1.696 | 2012 | 1.721 | 2011 | 1.752 | 2010 | 1.834 | 2009 | 1.942 | 2008 | 1.997 | 2007 | 2.014 | 2006 | 2.036 | 2005 | 2.01 | 2004 | 2 | 2003 | 1.914 | 2002 | 1.878 | 2001 | 1.863 | 2000 | 1.868 | 1999 | 1.905 | 1998 | 1.936 | 1997 | 1.974 | 1996 | 2.011 | 1995 | 2.07 | 1994 | 2.156 | 1993 | 2.232 | 1992 | 2.173 | 1991 | 2.579 | 1990 | 2.697 | 1989 | 2.114 | 1988 | 2.133 | 1987 | 2.189 | 1986 | 2.3 | 1985 | 2.458 | 1984 | 2.613 | 1983 | 2.829 | 1982 | 3.036 | 1981 | 3.226 | 1980 | 3.509 | 1979 | 3.795 | 1978 | 4.103 | 1977 | 4.361 | 1976 | 4.616 | 1975 | 4.805 | 1974 | 4.898 | 1973 | 5.121 | 1972 | 5.304 | 1971 | 5.567 | 1970 | 5.881 | 1969 | 6.309 | 1968 | 6.759 | 1967 | 7.149 | 1966 | 7.607 | 1965 | 8.127 | 1964 | 8.749 | 1963 | 9.391 | 1962 | 10.102 | 1961 | 10.818 | 1960 | 11.561 |
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