Year | Value | 2022 | 19,761 | 2021 | 19,805 | 2020 | 19,757 | 2019 | 19,623 | 2018 | 19,416 | 2017 | 19,198 | 2016 | 18,932 | 2015 | 18,613 | 2014 | 18,256 | 2013 | 17,855 | 2012 | 17,436 | 2011 | 17,039 | 2010 | 16,664 | 2009 | 16,342 | 2008 | 16,078 | 2007 | 15,958 | 2006 | 15,984 | 2005 | 16,050 | 2004 | 16,096 | 2003 | 15,968 | 2002 | 15,662 | 2001 | 15,235 | 2000 | 14,667 | 1999 | 13,996 | 1998 | 13,352 | 1997 | 12,747 | 1996 | 12,132 | 1995 | 11,542 | 1994 | 11,239 | 1993 | 10,995 | 1992 | 10,489 | 1991 | 9,948 | 1990 | 9,440 | 1989 | 9,058 | 1988 | 8,660 | 1987 | 8,234 | 1986 | 7,919 | 1985 | 7,614 | 1984 | 7,411 | 1983 | 7,329 | 1982 | 7,260 | 1981 | 7,319 | 1980 | 7,386 | 1979 | 7,345 | 1978 | 7,305 | 1977 | 7,279 | 1976 | 7,212 | 1975 | 7,099 | 1974 | 6,996 | 1973 | 6,894 | 1972 | 6,792 | 1971 | 6,687 | 1970 | 6,578 | 1969 | 6,465 | 1968 | 6,348 | 1967 | 6,231 | 1966 | 6,111 | 1965 | 5,991 | 1964 | 5,871 | 1963 | 5,752 | 1962 | 5,636 | 1961 | 5,522 | 1960 | 5,408 |
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