| Year | Value | | 2022 | 17,473 | | 2021 | 17,176 | | 2020 | 16,890 | | 2019 | 16,585 | | 2018 | 16,237 | | 2017 | 15,835 | | 2016 | 15,392 | | 2015 | 14,921 | | 2014 | 14,448 | | 2013 | 14,002 | | 2012 | 13,581 | | 2011 | 13,175 | | 2010 | 12,845 | | 2009 | 12,591 | | 2008 | 12,336 | | 2007 | 12,053 | | 2006 | 11,733 | | 2005 | 11,383 | | 2004 | 11,019 | | 2003 | 10,661 | | 2002 | 10,305 | | 2001 | 9,938 | | 2000 | 9,543 | | 1999 | 9,110 | | 1998 | 8,641 | | 1997 | 8,133 | | 1996 | 7,583 | | 1995 | 7,000 | | 1994 | 6,417 | | 1993 | 5,883 | | 1992 | 5,439 | | 1991 | 5,099 | | 1990 | 4,865 | | 1989 | 4,700 | | 1988 | 4,550 | | 1987 | 4,391 | | 1986 | 4,210 | | 1985 | 4,020 | | 1984 | 3,843 | | 1983 | 3,692 | | 1982 | 3,578 | | 1981 | 3,504 | | 1980 | 3,456 | | 1979 | 3,418 | | 1978 | 3,377 | | 1977 | 3,313 | | 1976 | 3,227 | | 1975 | 3,129 | | 1974 | 3,028 | | 1973 | 2,944 | | 1972 | 2,883 | | 1971 | 2,817 | | 1970 | 2,731 | | 1969 | 2,637 | | 1968 | 2,533 | | 1967 | 2,421 | | 1966 | 2,309 | | 1965 | 2,205 | | 1964 | 2,119 | | 1963 | 2,049 | | 1962 | 1,990 | | 1961 | 1,929 | | 1960 | 1,849 |
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