| Year | Value | | 2022 | 34,244 | | 2021 | 31,199 | | 2020 | 28,797 | | 2019 | 26,364 | | 2018 | 23,632 | | 2017 | 21,187 | | 2016 | 19,305 | | 2015 | 17,870 | | 2014 | 16,782 | | 2013 | 15,455 | | 2012 | 13,736 | | 2011 | 12,190 | | 2010 | 11,025 | | 2009 | 10,210 | | 2008 | 9,379 | | 2007 | 8,496 | | 2006 | 7,616 | | 2005 | 6,866 | | 2004 | 6,462 | | 2003 | 6,328 | | 2002 | 6,225 | | 2001 | 6,088 | | 2000 | 5,870 | | 1999 | 5,563 | | 1998 | 5,180 | | 1997 | 4,755 | | 1996 | 4,329 | | 1995 | 4,213 | | 1994 | 4,944 | | 1993 | 6,049 | | 1992 | 6,150 | | 1991 | 4,810 | | 1990 | 5,443 | | 1989 | 6,728 | | 1988 | 6,134 | | 1987 | 5,614 | | 1986 | 5,126 | | 1985 | 4,799 | | 1984 | 4,588 | | 1983 | 4,378 | | 1982 | 4,207 | | 1981 | 4,053 | | 1980 | 3,905 | | 1979 | 3,776 | | 1978 | 3,711 | | 1977 | 3,687 | | 1976 | 3,681 | | 1975 | 3,592 | | 1974 | 3,431 | | 1973 | 3,293 | | 1972 | 3,175 | | 1971 | 3,072 | | 1970 | 2,958 | | 1969 | 2,823 | | 1968 | 2,691 | | 1967 | 2,563 | | 1966 | 2,415 | | 1965 | 2,253 | | 1964 | 2,080 | | 1963 | 1,865 | | 1962 | 1,622 | | 1961 | 1,381 | | 1960 | 1,179 |
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