| Year | Value | | 2022 | 3,502 | | 2021 | 3,488 | | 2020 | 3,483 | | 2019 | 3,491 | | 2018 | 3,511 | | 2017 | 3,552 | | 2016 | 3,608 | | 2015 | 3,674 | | 2014 | 3,744 | | 2013 | 3,818 | | 2012 | 3,891 | | 2011 | 3,956 | | 2010 | 4,012 | | 2009 | 4,058 | | 2008 | 4,109 | | 2007 | 4,177 | | 2006 | 4,258 | | 2005 | 4,329 | | 2004 | 4,343 | | 2003 | 4,302 | | 2002 | 4,247 | | 2001 | 4,202 | | 2000 | 4,158 | | 1999 | 4,118 | | 1998 | 4,116 | | 1997 | 4,135 | | 1996 | 4,150 | | 1995 | 4,165 | | 1994 | 4,202 | | 1993 | 4,222 | | 1992 | 4,234 | | 1991 | 4,271 | | 1990 | 4,317 | | 1989 | 4,224 | | 1988 | 4,194 | | 1987 | 4,108 | | 1986 | 3,914 | | 1985 | 3,697 | | 1984 | 3,524 | | 1983 | 3,339 | | 1982 | 3,163 | | 1981 | 3,055 | | 1980 | 2,945 | | 1979 | 2,740 | | 1978 | 2,670 | | 1977 | 2,544 | | 1976 | 2,577 | | 1975 | 2,500 | | 1974 | 2,348 | | 1973 | 2,155 | | 1972 | 1,921 | | 1971 | 1,764 | | 1970 | 1,569 | | 1969 | 1,508 | | 1968 | 1,434 | | 1967 | 1,310 | | 1966 | 1,282 | | 1965 | 1,259 | | 1964 | 1,208 | | 1963 | 1,175 | | 1962 | 1,026 | | 1961 | 999 | | 1960 | 876 |
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