Year | Value | 2021 | 5.1 | 2020 | 5.3 | 2019 | 5.9 | 2018 | 6.4 | 2017 | 7 | 2016 | 7.9 | 2015 | 8.6 | 2014 | 8.6 | 2013 | 8.6 | 2012 | 9.6 | 2011 | 9.4 | 2010 | 9.4 | 2009 | 9 | 2008 | 9.4 | 2007 | 10.1 | 2006 | 9.2 | 2005 | 9 | 2004 | 9.8 | 2003 | 10.2 | 2002 | 10.3 | 2001 | 11.7 | 2000 | 13.5 | 1999 | 13.2 | 1998 | 13.7 | 1997 | 14.5 | 1996 | 15 | 1995 | 15.7 | 1994 | 16 | 1993 | 16 | 1992 | 16.7 | 1991 | 16.4 | 1990 | 15.2 | 1989 | 15.1 | 1988 | 15.1 | 1987 | 15 | 1986 | 15.4 | 1985 | 16.1 | 1984 | 16.7 | 1983 | 19.3 | 1982 | 21.6 | 1981 | 22.4 | 1980 | 22.6 | 1979 | 23 | 1978 | 20.3 | 1977 | 22.7 | 1976 | 22.2 | 1975 | 24.8 | 1974 | 26.6 | 1973 | 28.3 | 1972 | 28.4 | 1971 | 31.2 | 1970 | 31.2 | 1969 | 30.361 | 1968 | 30.454 | 1967 | 32.015 | 1966 | 33.429 | 1965 | 34.947 | 1964 | 36.448 | 1963 | 38.083 | 1962 | 39.657 | 1961 | 40.983 | 1960 | 41.93 |
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