Year | Value | 2022 | 31,969 | 2021 | 31,332 | 2020 | 30,651 | 2019 | 29,766 | 2018 | 28,843 | 2017 | 28,025 | 2016 | 27,278 | 2015 | 26,582 | 2014 | 25,934 | 2013 | 25,335 | 2012 | 24,787 | 2011 | 24,287 | 2010 | 23,818 | 2009 | 23,402 | 2008 | 23,036 | 2007 | 22,719 | 2006 | 22,470 | 2005 | 22,160 | 2004 | 21,825 | 2003 | 21,543 | 2002 | 21,242 | 2001 | 20,912 | 2000 | 20,526 | 1999 | 20,101 | 1998 | 19,656 | 1997 | 19,220 | 1996 | 18,838 | 1995 | 18,560 | 1994 | 18,442 | 1993 | 17,963 | 1992 | 17,289 | 1991 | 16,876 | 1990 | 16,453 | 1989 | 16,029 | 1988 | 15,600 | 1987 | 15,161 | 1986 | 14,737 | 1985 | 14,341 | 1984 | 13,970 | 1983 | 13,622 | 1982 | 13,296 | 1981 | 12,977 | 1980 | 12,637 | 1979 | 12,271 | 1978 | 11,883 | 1977 | 11,498 | 1976 | 11,157 | 1975 | 10,875 | 1974 | 10,647 | 1973 | 10,464 | 1972 | 10,319 | 1971 | 10,210 | 1970 | 10,137 | 1969 | 10,095 | 1968 | 10,076 | 1967 | 10,091 | 1966 | 10,159 | 1965 | 10,287 | 1964 | 10,483 | 1963 | 10,745 | 1962 | 11,071 | 1961 | 11,456 | 1960 | 11,881 |
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