Year | Value | 2022 | 59.226314829587 | 2021 | 58.374012829663 | 2020 | 57.494926202711 | 2019 | 56.587613558731 | 2018 | 55.652011094539 | 2017 | 54.688856233131 | 2016 | 53.701227202413 | 2015 | 52.705289048242 | 2014 | 51.704562328704 | 2013 | 50.698560338769 | 2012 | 49.689901990538 | 2011 | 48.675251510102 | 2010 | 47.635499985705 | 2009 | 46.531681171606 | 2008 | 45.427948398515 | 2007 | 44.324424440742 | 2006 | 43.225959778745 | 2005 | 42.115046958526 | 2004 | 40.979574275771 | 2003 | 39.848054892545 | 2002 | 38.727258050007 | 2001 | 37.61828254198 | 2000 | 36.588628898955 | 1999 | 35.672732774454 | 1998 | 34.781659447817 | 1997 | 33.901558308991 | 1996 | 33.034043885663 | 1995 | 32.176289390397 | 1994 | 31.333891057805 | 1993 | 30.504843964617 | 1992 | 29.691125902128 | 1991 | 28.890158404734 | 1990 | 28.113741467618 | 1989 | 27.402108589595 | 1988 | 26.704744390734 | 1987 | 26.020750411974 | 1986 | 25.35009649144 | 1985 | 24.690674914567 | 1984 | 24.041679005087 | 1983 | 23.403002609602 | 1982 | 22.782440799131 | 1981 | 22.063710654354 | 1980 | 21.355438897646 | 1979 | 20.675558362646 | 1978 | 20.028992090367 | 1977 | 19.626676891954 | 1976 | 19.459023878438 | 1975 | 19.294888925487 | 1974 | 19.233023221971 | 1973 | 19.020396135502 | 1972 | 18.884194043906 | 1971 | 18.834020564916 | 1970 | 18.804319043867 | 1969 | 18.77634873808 | 1968 | 18.754012467603 | 1967 | 18.740842503301 | 1966 | 18.741879206291 | 1965 | 18.781902559715 | 1964 | 18.852075277116 | 1963 | 18.371082963903 | 1962 | 17.898507098476 | 1961 | 17.42771369836 | 1960 | 16.955381354265 |
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