Year | Value | 2022 | 42.366710188528 | 2021 | 41.8286962799 | 2020 | 41.293026132019 | 2019 | 40.757858711627 | 2018 | 40.223086645972 | 2017 | 39.685703269684 | 2016 | 39.159380423502 | 2015 | 38.629766044181 | 2014 | 38.087496250709 | 2013 | 37.56027440187 | 2012 | 37.046909438432 | 2011 | 36.535352490449 | 2010 | 36.013412690925 | 2009 | 35.497846604018 | 2008 | 34.989868697828 | 2007 | 34.486737837707 | 2006 | 34.071238750366 | 2005 | 33.613738217167 | 2004 | 33.153662533596 | 2003 | 32.709562105813 | 2002 | 32.270458169053 | 2001 | 31.833614413995 | 2000 | 31.407208821595 | 1999 | 31.04519184231 | 1998 | 30.682807266447 | 1997 | 30.318107959654 | 1996 | 29.96328487966 | 1995 | 29.626796510764 | 1994 | 29.233489971543 | 1993 | 28.807118629752 | 1992 | 28.376661700111 | 1991 | 27.947147201633 | 1990 | 27.507940652458 | 1989 | 26.95718178881 | 1988 | 26.396370929734 | 1987 | 25.828180586179 | 1986 | 25.25904576801 | 1985 | 24.690840749354 | 1984 | 24.148750555427 | 1983 | 23.651653981553 | 1982 | 23.203839510598 | 1981 | 22.794521028216 | 1980 | 22.377333364341 | 1979 | 21.990649427086 | 1978 | 21.596167116143 | 1977 | 21.156512701763 | 1976 | 20.727689273708 | 1975 | 20.291817741802 | 1974 | 19.862801711435 | 1973 | 19.441164862117 | 1972 | 19.009132193438 | 1971 | 18.579094158249 | 1970 | 18.168189914006 | 1969 | 17.789291927378 | 1968 | 17.399746935684 | 1967 | 17.020715128451 | 1966 | 16.65066871496 | 1965 | 16.289694241535 | 1964 | 15.92745031028 | 1963 | 15.57743598739 | 1962 | 15.242441296222 | 1961 | 14.927429920696 | 1960 | 14.621829291868 |
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