| Year | Value | | 2022 | 19,284 | | 2021 | 18,371 | | 2020 | 17,464 | | 2019 | 16,555 | | 2018 | 15,554 | | 2017 | 14,519 | | 2016 | 13,487 | | 2015 | 12,448 | | 2014 | 11,455 | | 2013 | 10,599 | | 2012 | 9,909 | | 2011 | 9,353 | | 2010 | 8,906 | | 2009 | 8,523 | | 2008 | 8,161 | | 2007 | 7,783 | | 2006 | 7,359 | | 2005 | 6,871 | | 2004 | 6,322 | | 2003 | 5,749 | | 2002 | 5,212 | | 2001 | 4,760 | | 2000 | 4,390 | | 1999 | 4,094 | | 1998 | 3,867 | | 1997 | 3,700 | | 1996 | 3,590 | | 1995 | 3,539 | | 1994 | 3,523 | | 1993 | 3,525 | | 1992 | 3,556 | | 1991 | 3,615 | | 1990 | 3,693 | | 1989 | 3,756 | | 1988 | 3,796 | | 1987 | 3,840 | | 1986 | 3,892 | | 1985 | 3,942 | | 1984 | 3,953 | | 1983 | 3,917 | | 1982 | 3,860 | | 1981 | 3,791 | | 1980 | 3,716 | | 1979 | 3,647 | | 1978 | 3,580 | | 1977 | 3,524 | | 1976 | 3,470 | | 1975 | 3,398 | | 1974 | 3,308 | | 1973 | 3,202 | | 1972 | 3,093 | | 1971 | 2,986 | | 1970 | 2,881 | | 1969 | 2,780 | | 1968 | 2,682 | | 1967 | 2,587 | | 1966 | 2,509 | | 1965 | 2,459 | | 1964 | 2,417 | | 1963 | 2,364 | | 1962 | 2,307 | | 1961 | 2,253 | | 1960 | 2,200 |
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