Year | Value | 2022 | 1.865 | 2021 | 1.874 | 2020 | 1.766 | 2019 | 1.471 | 2018 | 1.324 | 2017 | 1.202 | 2016 | 1.102 | 2015 | 1.014 | 2014 | 0.948 | 2013 | 0.896 | 2012 | 0.85 | 2011 | 0.82 | 2010 | 0.795 | 2009 | 0.867 | 2008 | 1.011 | 2007 | 1.229 | 2006 | 1.449 | 2005 | 1.563 | 2004 | 1.613 | 2003 | 1.661 | 2002 | 1.987 | 2001 | 2.047 | 2000 | 2.107 | 1999 | 2.298 | 1998 | 2.473 | 1997 | 2.52 | 1996 | 2.58 | 1995 | 2.559 | 1994 | 2.566 | 1993 | 2.557 | 1992 | 2.598 | 1991 | 2.608 | 1990 | 2.704 | 1989 | 2.745 | 1988 | 2.801 | 1987 | 2.864 | 1986 | 3.058 | 1985 | 3.108 | 1984 | 3.184 | 1983 | 3.348 | 1982 | 3.446 | 1981 | 3.632 | 1980 | 3.913 | 1979 | 4.249 | 1978 | 4.597 | 1977 | 4.992 | 1976 | 5.46 | 1975 | 5.638 | 1974 | 5.847 |
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