| Year | Value | | 2022 | 17,791 | | 2021 | 17,106 | | 2020 | 16,498 | | 2019 | 15,830 | | 2018 | 15,114 | | 2017 | 14,435 | | 2016 | 13,844 | | 2015 | 13,300 | | 2014 | 12,794 | | 2013 | 12,365 | | 2012 | 12,009 | | 2011 | 11,714 | | 2010 | 11,324 | | 2009 | 10,842 | | 2008 | 10,417 | | 2007 | 10,042 | | 2006 | 9,722 | | 2005 | 9,454 | | 2004 | 9,229 | | 2003 | 9,052 | | 2002 | 8,932 | | 2001 | 8,741 | | 2000 | 8,441 | | 1999 | 8,161 | | 1998 | 7,921 | | 1997 | 7,714 | | 1996 | 7,542 | | 1995 | 7,405 | | 1994 | 7,316 | | 1993 | 7,287 | | 1992 | 7,176 | | 1991 | 6,908 | | 1990 | 6,608 | | 1989 | 6,319 | | 1988 | 6,039 | | 1987 | 5,773 | | 1986 | 5,537 | | 1985 | 5,352 | | 1984 | 5,226 | | 1983 | 5,167 | | 1982 | 5,146 | | 1981 | 5,065 | | 1980 | 4,899 | | 1979 | 4,684 | | 1978 | 4,454 | | 1977 | 4,259 | | 1976 | 4,145 | | 1975 | 4,211 | | 1974 | 4,521 | | 1973 | 4,889 | | 1972 | 4,875 | | 1971 | 4,547 | | 1970 | 4,232 | | 1969 | 3,910 | | 1968 | 3,579 | | 1967 | 3,248 | | 1966 | 2,954 | | 1965 | 2,746 | | 1964 | 2,656 | | 1963 | 2,675 | | 1962 | 2,772 | | 1961 | 2,906 | | 1960 | 2,873 |
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