Year | Value | 2022 | 60.074674901485 | 2021 | 59.714218248613 | 2020 | 59.474625379853 | 2019 | 59.198044726224 | 2018 | 58.82238148469 | 2017 | 58.425748229691 | 2016 | 57.941937814932 | 2015 | 57.38929129291 | 2014 | 56.8029884277 | 2013 | 56.232816812033 | 2012 | 55.724012452357 | 2011 | 55.235670048589 | 2010 | 54.741282538888 | 2009 | 54.19017164751 | 2008 | 53.518790295463 | 2007 | 52.772461374338 | 2006 | 52.018250115579 | 2005 | 51.373815643625 | 2004 | 50.850954473138 | 2003 | 50.402197504884 | 2002 | 49.965823631022 | 2001 | 49.543093236474 | 2000 | 49.114787293903 | 1999 | 48.677581368899 | 1998 | 48.250731063334 | 1997 | 47.842824677101 | 1996 | 47.447963660035 | 1995 | 47.069837658688 | 1994 | 46.700068748353 | 1993 | 46.346205832499 | 1992 | 46.015368894189 | 1991 | 45.640951424744 | 1990 | 45.062734331153 | 1989 | 44.465121744051 | 1988 | 43.883587900883 | 1987 | 43.292121146539 | 1986 | 42.722701707686 | 1985 | 42.214930145801 | 1984 | 41.74290171522 | 1983 | 41.299019318246 | 1982 | 40.88282857017 | 1981 | 40.396627584904 | 1980 | 39.929362283413 | 1979 | 39.398048371954 | 1978 | 38.893266587897 | 1977 | 38.40092498584 | 1976 | 37.909595290058 | 1975 | 37.379595699369 | 1974 | 36.846455319948 | 1973 | 36.304116591714 | 1972 | 35.774856343413 | 1971 | 35.218817322877 | 1970 | 34.663845523768 | 1969 | 34.114078600981 | 1968 | 33.570791588505 | 1967 | 33.046981641669 | 1966 | 32.530382976301 | 1965 | 31.966371626948 | 1964 | 31.40504022613 | 1963 | 30.874649369435 | 1962 | 30.387374643446 | 1961 | 29.918239751771 | 1960 | 29.470627120107 |
|