Year | Value | 2021 | 1.75 | 2020 | 1.75 | 2019 | 1.77 | 2018 | 1.76 | 2017 | 1.78 | 2016 | 1.79 | 2015 | 1.74 | 2014 | 1.75 | 2013 | 1.73 | 2012 | 1.72 | 2011 | 1.65 | 2010 | 1.7 | 2009 | 1.98 | 2008 | 1.89 | 2007 | 1.8 | 2006 | 1.73 | 2005 | 1.69 | 2004 | 1.751 | 2003 | 1.861 | 2002 | 1.801 | 2001 | 1.854 | 2000 | 2.065 | 1999 | 1.994 | 1998 | 1.952 | 1997 | 1.928 | 1996 | 1.944 | 1995 | 1.967 | 1994 | 1.959 | 1993 | 1.969 | 1992 | 2.001 | 1991 | 1.995 | 1990 | 1.944 | 1989 | 1.95 | 1988 | 1.993 | 1987 | 2.04 | 1986 | 2.039 | 1985 | 2.025 | 1984 | 2.095 | 1983 | 2.15 | 1982 | 2.178 | 1981 | 2.2 | 1980 | 2.216 | 1979 | 2.207 | 1978 | 2.238 | 1977 | 2.291 | 1976 | 2.345 | 1975 | 2.397 | 1974 | 2.462 | 1973 | 2.541 | 1972 | 2.624 | 1971 | 2.671 | 1970 | 2.678 | 1969 | 2.758 | 1968 | 2.811 | 1967 | 2.909 | 1966 | 3.051 | 1965 | 3.164 | 1964 | 3.268 | 1963 | 3.368 | 1962 | 3.443 | 1961 | 3.481 | 1960 | 3.498 |
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