Year | Value | 2022 | 26,464 | 2021 | 26,170 | 2020 | 25,752 | 2019 | 25,167 | 2018 | 24,490 | 2017 | 23,853 | 2016 | 23,291 | 2015 | 22,857 | 2014 | 22,587 | 2013 | 22,468 | 2012 | 22,456 | 2011 | 22,507 | 2010 | 22,613 | 2009 | 22,758 | 2008 | 22,904 | 2007 | 22,991 | 2006 | 22,932 | 2005 | 22,713 | 2004 | 22,371 | 2003 | 21,820 | 2002 | 21,124 | 2001 | 20,480 | 2000 | 19,969 | 1999 | 19,773 | 1998 | 19,872 | 1997 | 20,064 | 1996 | 20,273 | 1995 | 20,440 | 1994 | 20,615 | 1993 | 20,924 | 1992 | 21,292 | 1991 | 21,646 | 1990 | 22,056 | 1989 | 22,433 | 1988 | 22,682 | 1987 | 22,874 | 1986 | 22,908 | 1985 | 22,595 | 1984 | 21,964 | 1983 | 21,090 | 1982 | 20,049 | 1981 | 18,932 | 1980 | 17,849 | 1979 | 17,280 | 1978 | 17,210 | 1977 | 17,138 | 1976 | 16,948 | 1975 | 16,571 | 1974 | 16,001 | 1973 | 15,292 | 1972 | 14,540 | 1971 | 13,768 | 1970 | 13,106 | 1969 | 12,664 | 1968 | 12,345 | 1967 | 12,086 | 1966 | 11,868 | 1965 | 11,712 | 1964 | 11,617 | 1963 | 11,483 | 1962 | 11,233 | 1961 | 10,968 | 1960 | 10,755 |
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