| Year | Value | | 2022 | 50,277 | | 2021 | 51,772 | | 2020 | 53,321 | | 2019 | 55,732 | | 2018 | 57,370 | | 2017 | 58,664 | | 2016 | 61,334 | | 2015 | 64,146 | | 2014 | 66,530 | | 2013 | 68,291 | | 2012 | 69,481 | | 2011 | 69,953 | | 2010 | 69,647 | | 2009 | 68,810 | | 2008 | 67,450 | | 2007 | 65,404 | | 2006 | 62,964 | | 2005 | 60,515 | | 2004 | 58,320 | | 2003 | 56,610 | | 2002 | 55,489 | | 2001 | 54,598 | | 2000 | 53,609 | | 1999 | 52,514 | | 1998 | 51,404 | | 1997 | 50,554 | | 1996 | 50,483 | | 1995 | 51,444 | | 1994 | 53,121 | | 1993 | 55,132 | | 1992 | 57,198 | | 1991 | 58,935 | | 1990 | 60,056 | | 1989 | 60,553 | | 1988 | 60,352 | | 1987 | 59,421 | | 1986 | 58,109 | | 1985 | 56,977 | | 1984 | 56,435 | | 1983 | 56,117 | | 1982 | 55,471 | | 1981 | 54,472 | | 1980 | 52,981 | | 1979 | 50,863 | | 1978 | 48,579 | | 1977 | 46,545 | | 1976 | 44,576 | | 1975 | 42,510 | | 1974 | 40,439 | | 1973 | 38,473 | | 1972 | 36,629 | | 1971 | 34,924 | | 1970 | 33,379 | | 1969 | 32,226 | | 1968 | 31,446 | | 1967 | 30,747 | | 1966 | 30,103 | | 1965 | 29,532 | | 1964 | 29,024 | | 1963 | 28,546 | | 1962 | 28,109 | | 1961 | 27,734 | | 1960 | 27,454 |
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