Year | Value | 2021 | 1.383908045977 | 2020 | 1.4 | 2019 | 1.6 | 2018 | 1.7 | 2017 | 1.5 | 2016 | 1.7 | 2015 | 1.9 | 2014 | 2 | 2013 | 2.1 | 2012 | 2.2 | 2011 | 2.1 | 2010 | 2.2 | 2009 | 2.1 | 2008 | 2.2 | 2007 | 2 | 2006 | 2.1 | 2005 | 2.235 | 2004 | 2.242 | 2003 | 2.241 | 2002 | 2.23 | 2001 | 2.212 | 2000 | 2.19 | 1999 | 2.171 | 1998 | 2.16 | 1997 | 2.16 | 1996 | 2.172 | 1995 | 2.194 | 1994 | 2.223 | 1993 | 2.252 | 1992 | 2.276 | 1991 | 2.294 | 1990 | 2.304 | 1989 | 2.304 | 1988 | 2.297 | 1987 | 2.285 | 1986 | 2.273 | 1985 | 2.261 | 1984 | 2.254 | 1983 | 2.253 | 1982 | 2.262 | 1981 | 2.282 | 1980 | 2.312 | 1979 | 2.353 | 1978 | 2.402 | 1977 | 2.458 | 1976 | 2.524 | 1975 | 2.604 | 1974 | 2.705 | 1973 | 2.83 | 1972 | 2.976 | 1971 | 3.142 | 1970 | 3.32 | 1969 | 3.501 | 1968 | 3.675 | 1967 | 3.836 | 1966 | 3.983 | 1965 | 4.118 | 1964 | 4.248 | 1963 | 4.381 | 1962 | 4.519 | 1961 | 4.661 | 1960 | 4.801 |
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