| Year | Value | | 2022 | 5,361 | | 2021 | 5,267 | | 2020 | 5,179 | | 2019 | 5,117 | | 2018 | 5,077 | | 2017 | 5,038 | | 2016 | 4,993 | | 2015 | 4,942 | | 2014 | 4,883 | | 2013 | 4,804 | | 2012 | 4,698 | | 2011 | 4,557 | | 2010 | 4,373 | | 2009 | 4,180 | | 2008 | 3,984 | | 2007 | 3,776 | | 2006 | 3,580 | | 2005 | 3,400 | | 2004 | 3,216 | | 2003 | 3,056 | | 2002 | 2,942 | | 2001 | 2,868 | | 2000 | 2,849 | | 1999 | 2,889 | | 1998 | 2,980 | | 1997 | 3,104 | | 1996 | 3,235 | | 1995 | 3,350 | | 1994 | 3,426 | | 1993 | 3,441 | | 1992 | 3,394 | | 1991 | 3,304 | | 1990 | 3,187 | | 1989 | 3,056 | | 1988 | 2,926 | | 1987 | 2,808 | | 1986 | 2,694 | | 1985 | 2,576 | | 1984 | 2,462 | | 1983 | 2,364 | | 1982 | 2,282 | | 1981 | 2,220 | | 1980 | 2,170 | | 1979 | 2,121 | | 1978 | 2,083 | | 1977 | 2,060 | | 1976 | 2,034 | | 1975 | 1,994 | | 1974 | 1,936 | | 1973 | 1,861 | | 1972 | 1,794 | | 1971 | 1,753 | | 1970 | 1,720 | | 1969 | 1,678 | | 1968 | 1,653 | | 1967 | 1,654 | | 1966 | 1,649 | | 1965 | 1,627 | | 1964 | 1,597 | | 1963 | 1,577 | | 1962 | 1,565 | | 1961 | 1,560 | | 1960 | 1,560 |
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