| Year | Value | | 2022 | 4,676 | | 2021 | 4,516 | | 2020 | 4,331 | | 2019 | 4,163 | | 2018 | 4,003 | | 2017 | 3,839 | | 2016 | 3,693 | | 2015 | 3,562 | | 2014 | 3,431 | | 2013 | 3,321 | | 2012 | 3,248 | | 2011 | 3,200 | | 2010 | 3,177 | | 2009 | 3,185 | | 2008 | 3,226 | | 2007 | 3,279 | | 2006 | 3,325 | | 2005 | 3,362 | | 2004 | 3,369 | | 2003 | 3,322 | | 2002 | 3,241 | | 2001 | 3,157 | | 2000 | 3,066 | | 1999 | 2,964 | | 1998 | 2,868 | | 1997 | 2,768 | | 1996 | 2,660 | | 1995 | 2,556 | | 1994 | 2,462 | | 1993 | 2,370 | | 1992 | 2,288 | | 1991 | 2,222 | | 1990 | 2,161 | | 1989 | 2,098 | | 1988 | 2,029 | | 1987 | 1,950 | | 1986 | 1,862 | | 1985 | 1,771 | | 1984 | 1,682 | | 1983 | 1,615 | | 1982 | 1,576 | | 1981 | 1,554 | | 1980 | 1,544 | | 1979 | 1,543 | | 1978 | 1,546 | | 1977 | 1,545 | | 1976 | 1,542 | | 1975 | 1,540 | | 1974 | 1,539 | | 1973 | 1,516 | | 1972 | 1,482 | | 1971 | 1,463 | | 1970 | 1,450 | | 1969 | 1,431 | | 1968 | 1,420 | | 1967 | 1,425 | | 1966 | 1,435 | | 1965 | 1,427 | | 1964 | 1,394 | | 1963 | 1,359 | | 1962 | 1,321 | | 1961 | 1,280 | | 1960 | 1,240 |
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