Year | Value | 2022 | 57.45575897422 | 2021 | 56.889908724174 | 2020 | 56.305671940966 | 2019 | 55.718159866215 | 2018 | 55.119705026645 | 2017 | 54.513096703209 | 2016 | 53.899907017126 | 2015 | 53.281515738984 | 2014 | 52.654082819877 | 2013 | 52.023773841657 | 2012 | 51.401308834713 | 2011 | 50.787404639296 | 2010 | 50.16366924274 | 2009 | 49.512931314957 | 2008 | 48.858659571912 | 2007 | 48.205325981193 | 2006 | 47.55763035437 | 2005 | 46.90174118508 | 2004 | 46.234719784635 | 2003 | 45.574055944028 | 2002 | 44.923157694474 | 2001 | 44.280505564918 | 2000 | 43.690275412606 | 1999 | 43.14904625591 | 1998 | 42.618265205382 | 1997 | 42.093161556306 | 1996 | 41.576921551186 | 1995 | 41.066594854339 | 1994 | 40.558437732324 | 1993 | 40.049950738257 | 1992 | 39.54570009456 | 1991 | 39.042664377702 | 1990 | 38.537467417804 | 1989 | 38.052287494531 | 1988 | 37.551099105725 | 1987 | 37.033387383541 | 1986 | 36.512580313665 | 1985 | 35.984101103865 | 1984 | 35.450305581872 | 1983 | 34.914499594456 | 1982 | 34.393101445737 | 1981 | 33.820459934183 | 1980 | 33.227412972367 | 1979 | 32.646300310136 | 1978 | 32.070938464689 | 1977 | 31.602256333669 | 1976 | 31.237457495563 | 1975 | 30.879926740504 | 1974 | 30.518913967161 | 1973 | 30.170597215284 | 1972 | 29.869489280351 | 1971 | 29.612310005158 | 1970 | 29.398029494582 | 1969 | 29.194312952769 | 1968 | 28.983864437495 | 1967 | 28.762184857914 | 1966 | 28.535958115705 | 1965 | 28.324365804139 | 1964 | 28.101827948527 | 1963 | 27.618029796053 | 1962 | 27.143303515807 | 1961 | 26.6175535144 | 1960 | 26.047476441724 |
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