| Year | Value | | 2022 | 24,872 | | 2021 | 24,285 | | 2020 | 23,458 | | 2019 | 22,179 | | 2018 | 20,486 | | 2017 | 18,681 | | 2016 | 16,967 | | 2015 | 15,544 | | 2014 | 14,533 | | 2013 | 13,897 | | 2012 | 13,502 | | 2011 | 13,189 | | 2010 | 12,845 | | 2009 | 12,376 | | 2008 | 11,703 | | 2007 | 10,919 | | 2006 | 10,166 | | 2005 | 9,501 | | 2004 | 8,914 | | 2003 | 8,468 | | 2002 | 8,163 | | 2001 | 7,875 | | 2000 | 7,578 | | 1999 | 7,267 | | 1998 | 6,969 | | 1997 | 6,712 | | 1996 | 6,486 | | 1995 | 6,288 | | 1994 | 6,106 | | 1993 | 5,944 | | 1992 | 5,798 | | 1991 | 5,654 | | 1990 | 5,510 | | 1989 | 5,369 | | 1988 | 5,225 | | 1987 | 5,072 | | 1986 | 4,914 | | 1985 | 4,752 | | 1984 | 4,579 | | 1983 | 4,395 | | 1982 | 4,186 | | 1981 | 3,979 | | 1980 | 3,828 | | 1979 | 3,764 | | 1978 | 3,785 | | 1977 | 3,856 | | 1976 | 3,986 | | 1975 | 4,146 | | 1974 | 4,294 | | 1973 | 4,433 | | 1972 | 4,557 | | 1971 | 4,673 | | 1970 | 4,776 | | 1969 | 4,838 | | 1968 | 4,814 | | 1967 | 4,737 | | 1966 | 4,661 | | 1965 | 4,587 | | 1964 | 4,517 | | 1963 | 4,449 | | 1962 | 4,387 | | 1961 | 4,339 | | 1960 | 4,309 |
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