Year | Value | 2021 | 60.099 | 2020 | 60.449 | 2019 | 60.817 | 2018 | 60.298 | 2017 | 60.212 | 2016 | 59.69 | 2015 | 59.307 | 2014 | 59.248 | 2013 | 59.007 | 2012 | 58.731 | 2011 | 58.107 | 2010 | 57.842 | 2009 | 57.309 | 2008 | 57.042 | 2007 | 56.447 | 2006 | 55.851 | 2005 | 55.288 | 2004 | 54.649 | 2003 | 54.085 | 2002 | 53.643 | 2001 | 53.118 | 2000 | 52.832 | 1999 | 52.763 | 1998 | 52.489 | 1997 | 52.033 | 1996 | 51.173 | 1995 | 50.568 | 1994 | 49.945 | 1993 | 49.761 | 1992 | 49.161 | 1991 | 48.198 | 1990 | 47.522 | 1989 | 47.498 | 1988 | 47.364 | 1987 | 47.36 | 1986 | 46.916 | 1985 | 46.666 | 1984 | 46.093 | 1983 | 45.667 | 1982 | 45.211 | 1981 | 44.745 | 1980 | 44.322 | 1979 | 43.82 | 1978 | 43.31 | 1977 | 42.79 | 1976 | 42.316 | 1975 | 41.92 | 1974 | 41.432 | 1973 | 41.184 | 1972 | 41.075 | 1971 | 40.686 | 1970 | 40.4 | 1969 | 40.113 | 1968 | 39.959 | 1967 | 39.455 | 1966 | 39.135 | 1965 | 38.969 | 1964 | 38.69 | 1963 | 38.542 | 1962 | 38.223 | 1961 | 38.047 | 1960 | 37.889 |
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