| Year | Value | | 2022 | 18,110 | | 2021 | 17,468 | | 2020 | 16,572 | | 2019 | 15,467 | | 2018 | 14,332 | | 2017 | 13,310 | | 2016 | 12,415 | | 2015 | 11,546 | | 2014 | 10,541 | | 2013 | 9,364 | | 2012 | 8,165 | | 2011 | 7,076 | | 2010 | 6,183 | | 2009 | 5,529 | | 2008 | 5,148 | | 2007 | 4,970 | | 2006 | 4,854 | | 2005 | 4,784 | | 2004 | 4,720 | | 2003 | 4,662 | | 2002 | 4,634 | | 2001 | 4,590 | | 2000 | 4,541 | | 1999 | 4,520 | | 1998 | 4,499 | | 1997 | 4,452 | | 1996 | 4,373 | | 1995 | 4,282 | | 1994 | 4,182 | | 1993 | 4,028 | | 1992 | 3,833 | | 1991 | 3,681 | | 1990 | 3,591 | | 1989 | 3,525 | | 1988 | 3,489 | | 1987 | 3,490 | | 1986 | 3,479 | | 1985 | 3,425 | | 1984 | 3,351 | | 1983 | 3,258 | | 1982 | 3,150 | | 1981 | 3,051 | | 1980 | 3,000 | | 1979 | 2,987 | | 1978 | 2,970 | | 1977 | 2,919 | | 1976 | 2,819 | | 1975 | 2,675 | | 1974 | 2,511 | | 1973 | 2,353 | | 1972 | 2,221 | | 1971 | 2,124 | | 1970 | 2,068 | | 1969 | 2,026 | | 1968 | 1,979 | | 1967 | 1,921 | | 1966 | 1,842 | | 1965 | 1,686 | | 1964 | 1,540 | | 1963 | 1,440 | | 1962 | 1,344 | | 1961 | 1,318 | | 1960 | 1,328 |
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