Year | Value | 2022 | 19,468 | 2021 | 18,551 | 2020 | 19,392 | 2019 | 21,473 | 2018 | 23,863 | 2017 | 26,023 | 2016 | 27,403 | 2015 | 27,964 | 2014 | 27,962 | 2013 | 27,650 | 2012 | 27,320 | 2011 | 27,152 | 2010 | 27,109 | 2009 | 27,109 | 2008 | 27,108 | 2007 | 26,922 | 2006 | 26,361 | 2005 | 25,560 | 2004 | 24,607 | 2003 | 23,588 | 2002 | 22,736 | 2001 | 22,077 | 2000 | 21,516 | 1999 | 20,972 | 1998 | 20,273 | 1997 | 19,528 | 1996 | 18,960 | 1995 | 18,479 | 1994 | 18,368 | 1993 | 18,958 | 1992 | 20,125 | 1991 | 21,396 | 1990 | 22,460 | 1989 | 23,077 | 1988 | 22,707 | 1987 | 21,615 | 1986 | 20,455 | 1985 | 19,471 | 1984 | 18,902 | 1983 | 18,718 | 1982 | 18,640 | 1981 | 18,556 | 1980 | 18,400 | 1979 | 18,113 | 1978 | 17,665 | 1977 | 17,067 | 1976 | 16,280 | 1975 | 15,269 | 1974 | 14,120 | 1973 | 12,895 | 1972 | 11,694 | 1971 | 10,718 | 1970 | 10,101 | 1969 | 9,865 | 1968 | 10,074 | 1967 | 10,592 | 1966 | 11,041 | 1965 | 11,189 | 1964 | 11,031 | 1963 | 10,542 | 1962 | 9,774 | 1961 | 8,993 | 1960 | 8,364 |
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