Year | Value | 2021 | 45.457484642742 | 2020 | 45.457484642742 | 2019 | 45.447294707285 | 2018 | 45.448079658606 | 2017 | 44.596319454543 | 2016 | 44.43151891167 | 2015 | 44.269949751991 | 2014 | 43.693190878648 | 2013 | 43.693190878648 | 2012 | 43.693190878648 | 2011 | 43.533726678361 | 2010 | 41.779620475203 | 2009 | 41.620156274916 | 2008 | 41.380959974486 | 2007 | 38.111943868602 | 2006 | 38.909264870037 | 2005 | 40.025514272046 | 2004 | 36.836230266305 | 2003 | 37.793015468027 | 2002 | 37.569765587626 | 2001 | 37.490033487482 | 2000 | 37.474087067453 | 1999 | 37.39435496731 | 1998 | 37.139212246851 | 1997 | 37.123265826822 | 1996 | 37.107319406793 | 1995 | 37.091372986764 | 1994 | 37.043533726678 | 1993 | 36.995694466592 | 1992 | 37.378408547281 | 1991 | 37.346515707224 | 1990 | 37.298676447138 | 1989 | 37.314622867166 | 1988 | 37.26678360708 | 1987 | 37.218944346994 | 1986 | 37.091372986764 | 1985 | 36.915962366449 | 1984 | 36.852176686334 | 1983 | 36.804337426248 | 1982 | 36.612980385903 | 1981 | 37.458140647425 | 1980 | 37.458140647425 | 1979 | 37.617604847712 | 1978 | 39.371711050869 | 1977 | 38.797639929836 | 1976 | 38.207622388774 | 1975 | 37.617604847712 | 1974 | 37.585712007654 | 1973 | 37.490033487482 | 1972 | 37.39435496731 | 1971 | 37.298676447138 | 1970 | 37.202997926965 | 1969 | 37.123265826822 | 1968 | 37.011640886621 | 1967 | 35.959177164726 | 1966 | 35.161856163291 | 1965 | 34.380481581885 | 1964 | 33.535321320364 | 1963 | 32.849625259129 | 1962 | 27.220538988997 | 1961 | 27.475681709456 |
|