Year | Value | 2021 | 30.949 | 2020 | 31.343 | 2019 | 31.701 | 2018 | 32.088 | 2017 | 32.477 | 2016 | 32.759 | 2015 | 32.765 | 2014 | 33.079 | 2013 | 33.699 | 2012 | 34.271 | 2011 | 35.063 | 2010 | 36.041 | 2009 | 36.743 | 2008 | 37.05 | 2007 | 37.44 | 2006 | 37.757 | 2005 | 38.015 | 2004 | 38.275 | 2003 | 38.666 | 2002 | 39.09 | 2001 | 39.813 | 2000 | 40.417 | 1999 | 41.475 | 1998 | 42.305 | 1997 | 43.181 | 1996 | 43.769 | 1995 | 44.184 | 1994 | 44.292 | 1993 | 44.329 | 1992 | 44.319 | 1991 | 44.397 | 1990 | 44.467 | 1989 | 44.233 | 1988 | 44.166 | 1987 | 44.112 | 1986 | 43.762 | 1985 | 44.026 | 1984 | 44.075 | 1983 | 44.203 | 1982 | 44.539 | 1981 | 44.77 | 1980 | 45.412 | 1979 | 46.02 | 1978 | 46.418 | 1977 | 46.679 | 1976 | 46.892 | 1975 | 47.158 | 1974 | 47.53 | 1973 | 47.93 | 1972 | 48.315 | 1971 | 48.417 | 1970 | 47.646 | 1969 | 47.197 | 1968 | 46.872 | 1967 | 46.575 | 1966 | 46.376 | 1965 | 46.143 | 1964 | 46.338 | 1963 | 46.486 | 1962 | 46.736 | 1961 | 47.025 | 1960 | 47.344 |
|