Year | Value | 2021 | 1.8 | 2020 | 2.019 | 2019 | 2.08 | 2018 | 2 | 2017 | 2.09 | 2016 | 2 | 2015 | 2.01 | 2014 | 2.037 | 2013 | 2.077 | 2012 | 2.019 | 2011 | 2.117 | 2010 | 2.195 | 2009 | 2.359 | 2008 | 2.247 | 2007 | 2.299 | 2006 | 2.256 | 2005 | 2.377 | 2004 | 2.415 | 2003 | 2.372 | 2002 | 2.566 | 2001 | 2.51 | 2000 | 2.329 | 1999 | 2.415 | 1998 | 2.457 | 1997 | 2.69 | 1996 | 2.493 | 1995 | 2.512 | 1994 | 2.527 | 1993 | 2.578 | 1992 | 2.607 | 1991 | 2.421 | 1990 | 2.444 | 1989 | 2.299 | 1988 | 2.317 | 1987 | 2.083 | 1986 | 2.044 | 1985 | 2.241 | 1984 | 2.107 | 1983 | 2.054 | 1982 | 2.236 | 1981 | 2.332 | 1980 | 2.435 | 1979 | 2.187 | 1978 | 2.197 | 1977 | 2.349 | 1976 | 2.255 | 1975 | 2.345 |
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