| Year | Value | | 2022 | 17,422 | | 2021 | 17,192 | | 2020 | 16,956 | | 2019 | 16,740 | | 2018 | 16,549 | | 2017 | 16,397 | | 2016 | 16,271 | | 2015 | 16,136 | | 2014 | 15,954 | | 2013 | 15,684 | | 2012 | 15,300 | | 2011 | 14,802 | | 2010 | 14,180 | | 2009 | 13,524 | | 2008 | 12,967 | | 2007 | 12,528 | | 2006 | 12,197 | | 2005 | 11,948 | | 2004 | 11,740 | | 2003 | 11,521 | | 2002 | 11,259 | | 2001 | 10,948 | | 2000 | 10,582 | | 1999 | 10,173 | | 1998 | 9,728 | | 1997 | 9,251 | | 1996 | 8,742 | | 1995 | 8,206 | | 1994 | 7,660 | | 1993 | 7,127 | | 1992 | 6,608 | | 1991 | 6,077 | | 1990 | 5,541 | | 1989 | 5,030 | | 1988 | 4,581 | | 1987 | 4,243 | | 1986 | 4,022 | | 1985 | 3,898 | | 1984 | 3,830 | | 1983 | 3,757 | | 1982 | 3,657 | | 1981 | 3,541 | | 1980 | 3,431 | | 1979 | 3,349 | | 1978 | 3,293 | | 1977 | 3,248 | | 1976 | 3,197 | | 1975 | 3,117 | | 1974 | 2,999 | | 1973 | 2,849 | | 1972 | 2,682 | | 1971 | 2,514 | | 1970 | 2,359 | | 1969 | 2,235 | | 1968 | 2,146 | | 1967 | 2,078 | | 1966 | 2,027 | | 1965 | 1,978 | | 1964 | 1,923 | | 1963 | 1,855 | | 1962 | 1,781 | | 1961 | 1,708 | | 1960 | 1,627 |
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