Year | Value | 2022 | 1.179 | 2021 | 1.18 | 2020 | 1.325 | 2019 | 1.486 | 2018 | 1.587 | 2017 | 1.839 | 2016 | 1.953 | 2015 | 1.972 | 2014 | 2.148 | 2013 | 2.117 | 2012 | 2.028 | 2011 | 1.962 | 2010 | 1.941 | 2009 | 1.919 | 2008 | 1.935 | 2007 | 1.928 | 2006 | 1.909 | 2005 | 1.777 | 2004 | 1.683 | 2003 | 1.747 | 2002 | 1.763 | 2001 | 1.833 | 2000 | 1.904 | 1999 | 1.869 | 1998 | 1.957 | 1997 | 2.144 | 1996 | 2.153 | 1995 | 2.19 | 1994 | 2.125 | 1993 | 2.226 | 1992 | 2.277 | 1991 | 2.314 | 1990 | 2.303 | 1989 | 2.272 | 1988 | 2.291 | 1987 | 2.307 | 1986 | 2.32 | 1985 | 2.332 | 1984 | 2.342 | 1983 | 2.353 | 1982 | 2.364 | 1981 | 2.377 | 1980 | 2.392 | 1979 | 2.408 | 1978 | 2.425 | 1977 | 2.446 | 1976 | 2.472 | 1975 | 2.506 | 1974 | 2.552 |
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