Year | Value | 2020 | 2.387 | 2019 | 2.258 | 2018 | 2.124 | 2017 | 2.006 | 2016 | 1.891 | 2015 | 1.8 | 2014 | 1.715 | 2013 | 1.661 | 2012 | 1.565 | 2011 | 1.489 | 2010 | 1.463 | 2009 | 1.423 | 2008 | 1.347 | 2007 | 1.298 | 2006 | 1.278 | 2005 | 1.244 | 2004 | 1.22 | 2003 | 1.19 | 2002 | 1.143 | 2001 | 1.287 | 2000 | 1.268 | 1999 | 1.244 | 1998 | 1.214 | 1997 | 1.216 | 1996 | 1.201 | 1995 | 1.194 | 1990 | 1.129 | 1989 | 1.54 | 1988 | 1.47 | 1987 | 1.37 | 1986 | 1.35 | 1984 | 1.33 | 1983 | 1.32 | 1982 | 1.3 | 1981 | 1.25 | 1979 | 1.12 | 1977 | 1.03 | 1976 | 1 | 1975 | 0.96 | 1974 | 0.92 | 1973 | 0.89 | 1972 | 0.86 | 1971 | 0.85 | 1970 | 0.86 | 1969 | 0.88 | 1968 | 0.91 | 1967 | 0.94 | 1966 | 0.96 | 1965 | 1.07 |
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