Year | Value | 2022 | 18,145 | 2021 | 17,494 | 2020 | 16,979 | 2019 | 16,523 | 2018 | 16,117 | 2017 | 15,788 | 2016 | 15,514 | 2015 | 15,276 | 2014 | 15,059 | 2013 | 14,851 | 2012 | 14,636 | 2011 | 14,401 | 2010 | 14,142 | 2009 | 13,849 | 2008 | 13,520 | 2007 | 13,160 | 2006 | 12,786 | 2005 | 12,425 | 2004 | 12,090 | 2003 | 11,784 | 2002 | 11,514 | 2001 | 11,293 | 2000 | 11,121 | 1999 | 11,012 | 1998 | 10,967 | 1997 | 10,964 | 1996 | 10,978 | 1995 | 11,001 | 1994 | 11,008 | 1993 | 10,979 | 1992 | 10,945 | 1991 | 10,963 | 1990 | 10,959 | 1989 | 10,880 | 1988 | 10,776 | 1987 | 10,647 | 1986 | 10,498 | 1985 | 10,335 | 1984 | 10,165 | 1983 | 9,994 | 1982 | 9,830 | 1981 | 9,679 | 1980 | 9,547 | 1979 | 9,577 | 1978 | 10,001 | 1977 | 10,613 | 1976 | 11,097 | 1975 | 11,434 | 1974 | 11,615 | 1973 | 11,586 | 1972 | 11,417 | 1971 | 11,257 | 1970 | 11,031 | 1969 | 10,752 | 1968 | 10,438 | 1967 | 10,041 | 1966 | 9,668 | 1965 | 9,350 | 1964 | 9,052 | 1963 | 8,643 | 1962 | 8,114 | 1961 | 7,653 | 1960 | 7,364 |
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