| Year | Value | | 2022 | 43,443 | | 2021 | 42,548 | | 2020 | 41,629 | | 2019 | 40,725 | | 2018 | 39,906 | | 2017 | 39,193 | | 2016 | 38,590 | | 2015 | 38,090 | | 2014 | 37,659 | | 2013 | 37,246 | | 2012 | 36,813 | | 2011 | 36,335 | | 2010 | 35,783 | | 2009 | 35,129 | | 2008 | 34,356 | | 2007 | 33,511 | | 2006 | 32,568 | | 2005 | 31,716 | | 2004 | 31,054 | | 2003 | 30,384 | | 2002 | 29,330 | | 2001 | 27,842 | | 2000 | 26,376 | | 1999 | 24,979 | | 1998 | 23,484 | | 1997 | 21,848 | | 1996 | 20,544 | | 1995 | 19,793 | | 1994 | 19,395 | | 1993 | 18,837 | | 1992 | 19,021 | | 1991 | 19,020 | | 1990 | 17,344 | | 1989 | 15,552 | | 1988 | 14,302 | | 1987 | 13,340 | | 1986 | 12,485 | | 1985 | 11,852 | | 1984 | 11,500 | | 1983 | 11,358 | | 1982 | 11,266 | | 1981 | 11,083 | | 1980 | 10,694 | | 1979 | 10,032 | | 1978 | 9,173 | | 1977 | 8,283 | | 1976 | 7,466 | | 1975 | 6,760 | | 1974 | 6,181 | | 1973 | 5,719 | | 1972 | 5,329 | | 1971 | 4,976 | | 1970 | 4,659 | | 1969 | 4,372 | | 1968 | 4,123 | | 1967 | 3,909 | | 1966 | 3,704 | | 1965 | 3,507 | | 1964 | 3,317 | | 1963 | 3,144 | | 1962 | 2,994 | | 1961 | 2,865 | | 1960 | 2,754 |
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