| Year | Value | | 2022 | 16,578 | | 2021 | 15,505 | | 2020 | 14,741 | | 2019 | 14,341 | | 2018 | 14,232 | | 2017 | 14,274 | | 2016 | 14,259 | | 2015 | 13,975 | | 2014 | 13,311 | | 2013 | 12,300 | | 2012 | 11,105 | | 2011 | 9,972 | | 2010 | 9,139 | | 2009 | 8,685 | | 2008 | 8,530 | | 2007 | 8,512 | | 2006 | 8,430 | | 2005 | 8,196 | | 2004 | 7,822 | | 2003 | 7,375 | | 2002 | 6,931 | | 2001 | 6,541 | | 2000 | 6,210 | | 1999 | 5,975 | | 1998 | 5,820 | | 1997 | 5,680 | | 1996 | 5,552 | | 1995 | 5,430 | | 1994 | 5,304 | | 1993 | 5,174 | | 1992 | 5,043 | | 1991 | 4,917 | | 1990 | 4,803 | | 1989 | 4,694 | | 1988 | 4,587 | | 1987 | 4,485 | | 1986 | 4,383 | | 1985 | 4,272 | | 1984 | 4,155 | | 1983 | 4,035 | | 1982 | 3,869 | | 1981 | 3,674 | | 1980 | 3,524 | | 1979 | 3,444 | | 1978 | 3,426 | | 1977 | 3,444 | | 1976 | 3,513 | | 1975 | 3,621 | | 1974 | 3,739 | | 1973 | 3,868 | | 1972 | 4,002 | | 1971 | 4,128 | | 1970 | 4,229 | | 1969 | 4,287 | | 1968 | 4,272 | | 1967 | 4,210 | | 1966 | 4,147 | | 1965 | 4,090 | | 1964 | 4,040 | | 1963 | 3,994 | | 1962 | 3,956 | | 1961 | 3,927 | | 1960 | 3,903 |
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