Year | Value | 2022 | 1.265 | 2021 | 1.16 | 2020 | 1.217 | 2019 | 1.228 | 2018 | 1.301 | 2017 | 1.374 | 2016 | 1.466 | 2015 | 1.506 | 2014 | 1.498 | 2013 | 1.506 | 2012 | 1.531 | 2011 | 1.459 | 2010 | 1.443 | 2009 | 1.473 | 2008 | 1.458 | 2007 | 1.345 | 2006 | 1.31 | 2005 | 1.213 | 2004 | 1.218 | 2003 | 1.172 | 2002 | 1.095 | 2001 | 1.078 | 2000 | 1.116 | 1999 | 1.127 | 1998 | 1.211 | 1997 | 1.272 | 1996 | 1.335 | 1995 | 1.398 | 1994 | 1.468 | 1993 | 1.562 | 1992 | 1.674 | 1991 | 1.776 | 1990 | 1.85 | 1989 | 1.935 | 1988 | 2.02 | 1987 | 2.05 | 1986 | 2.08 | 1985 | 2.06 | 1984 | 2.09 | 1983 | 2.08 | 1982 | 1.98 | 1981 | 1.93 | 1980 | 1.95 | 1979 | 1.96 | 1978 | 1.96 | 1977 | 1.94 | 1976 | 1.99 | 1975 | 2.02 | 1974 | 2.04 |
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