| Year | Value | | 2022 | 63,393 | | 2021 | 61,438 | | 2020 | 59,895 | | 2019 | 58,012 | | 2018 | 55,427 | | 2017 | 52,585 | | 2016 | 49,612 | | 2015 | 46,758 | | 2014 | 44,482 | | 2013 | 42,890 | | 2012 | 41,779 | | 2011 | 41,000 | | 2010 | 40,273 | | 2009 | 39,523 | | 2008 | 38,771 | | 2007 | 38,069 | | 2006 | 37,520 | | 2005 | 37,151 | | 2004 | 36,379 | | 2003 | 35,136 | | 2002 | 33,878 | | 2001 | 32,552 | | 2000 | 31,135 | | 1999 | 29,653 | | 1998 | 28,135 | | 1997 | 26,585 | | 1996 | 25,036 | | 1995 | 23,942 | | 1994 | 23,303 | | 1993 | 22,714 | | 1992 | 22,160 | | 1991 | 21,588 | | 1990 | 20,978 | | 1989 | 20,337 | | 1988 | 19,686 | | 1987 | 19,063 | | 1986 | 18,487 | | 1985 | 17,967 | | 1984 | 17,502 | | 1983 | 17,066 | | 1982 | 16,629 | | 1981 | 16,176 | | 1980 | 15,707 | | 1979 | 15,304 | | 1978 | 14,939 | | 1977 | 14,499 | | 1976 | 14,035 | | 1975 | 13,587 | | 1974 | 13,154 | | 1973 | 12,731 | | 1972 | 12,372 | | 1971 | 12,043 | | 1970 | 11,706 | | 1969 | 11,412 | | 1968 | 11,167 | | 1967 | 10,960 | | 1966 | 10,737 | | 1965 | 10,463 | | 1964 | 10,138 | | 1963 | 9,756 | | 1962 | 9,337 | | 1961 | 8,965 | | 1960 | 8,697 |
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