Year | Value | 2022 | 71.795634000484 | 2021 | 71.577115685756 | 2020 | 70.895665886018 | 2019 | 71.016730598043 | 2018 | 71.273077304524 | 2017 | 71.998398210405 | 2016 | 71.912956633095 | 2015 | 72.444522561601 | 2014 | 73.199296632855 | 2013 | 73.578806718652 | 2012 | 73.320505588147 | 2011 | 73.276307323548 | 2010 | 73.994463066563 | 2009 | 74.165778550098 | 2008 | 71.097406740037 | 2007 | 70.760531177823 | 2006 | 72.47354003714 | 2005 | 73.156000414523 | 2004 | 72.75331376425 | 2003 | 73.06301761829 | 2002 | 72.378605317692 | 2001 | 73.08732412658 | 2000 | 73.086425093471 | 1999 | 73.475532912391 | 1998 | 73.857129491566 | 1997 | 74.363116758589 | 1996 | 75.073775255165 | 1995 | 74.528147671053 | 1994 | 75.139487911561 | 1993 | 75.324086903024 | 1992 | 74.574824709503 | 1991 | 73.546219574682 | 1990 | 73.855556580485 | 1989 | 74.133348708504 | 1988 | 74.786194318929 | 1987 | 75.536320352815 | 1986 | 75.681433373718 | 1985 | 76.267409261965 | 1984 | 76.163868817628 | 1983 | 77.215207849658 | 1982 | 75.996259347021 | 1981 | 75.422964096972 | 1980 | 73.988079861789 | 1979 | 73.291501371487 | 1978 | 73.78348328835 | 1977 | 74.99875104203 | 1976 | 74.298412155169 | 1975 | 73.417522669002 | 1974 | 69.231444142185 | 1973 | 68.765382292814 | 1972 | 68.779227708349 | 1971 | 69.563156066688 | 1970 | 69.286908446618 |
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