| Year | Value | | 2022 | 7,751 | | 2021 | 7,531 | | 2020 | 7,244 | | 2019 | 6,889 | | 2018 | 6,503 | | 2017 | 6,120 | | 2016 | 5,796 | | 2015 | 5,526 | | 2014 | 5,315 | | 2013 | 5,149 | | 2012 | 5,030 | | 2011 | 4,966 | | 2010 | 4,936 | | 2009 | 4,907 | | 2008 | 4,861 | | 2007 | 4,786 | | 2006 | 4,673 | | 2005 | 4,523 | | 2004 | 4,352 | | 2003 | 4,194 | | 2002 | 4,103 | | 2001 | 4,116 | | 2000 | 4,240 | | 1999 | 4,455 | | 1998 | 4,703 | | 1997 | 4,914 | | 1996 | 5,027 | | 1995 | 4,987 | | 1994 | 4,797 | | 1993 | 4,512 | | 1992 | 4,207 | | 1991 | 3,949 | | 1990 | 3,822 | | 1989 | 3,835 | | 1988 | 3,930 | | 1987 | 4,063 | | 1986 | 4,194 | | 1985 | 4,286 | | 1984 | 4,312 | | 1983 | 4,276 | | 1982 | 4,198 | | 1981 | 4,100 | | 1980 | 4,037 | | 1979 | 4,025 | | 1978 | 4,043 | | 1977 | 4,073 | | 1976 | 4,095 | | 1975 | 4,092 | | 1974 | 4,050 | | 1973 | 3,968 | | 1972 | 3,858 | | 1971 | 3,735 | | 1970 | 3,622 | | 1969 | 3,534 | | 1968 | 3,470 | | 1967 | 3,425 | | 1966 | 3,391 | | 1965 | 3,354 | | 1964 | 3,308 | | 1963 | 3,251 | | 1962 | 3,187 | | 1961 | 3,124 | | 1960 | 3,038 |
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