| Year | Value | | 2022 | 288,816 | | 2021 | 291,554 | | 2020 | 292,335 | | 2019 | 295,956 | | 2018 | 299,381 | | 2017 | 300,883 | | 2016 | 299,633 | | 2015 | 295,011 | | 2014 | 287,950 | | 2013 | 278,294 | | 2012 | 265,972 | | 2011 | 253,607 | | 2010 | 242,718 | | 2009 | 231,983 | | 2008 | 222,682 | | 2007 | 216,638 | | 2006 | 212,637 | | 2005 | 209,829 | | 2004 | 207,258 | | 2003 | 204,767 | | 2002 | 203,479 | | 2001 | 201,780 | | 2000 | 198,355 | | 1999 | 193,447 | | 1998 | 187,672 | | 1997 | 182,395 | | 1996 | 178,678 | | 1995 | 177,686 | | 1994 | 179,830 | | 1993 | 184,305 | | 1992 | 189,166 | | 1991 | 192,969 | | 1990 | 195,461 | | 1989 | 195,641 | | 1988 | 192,386 | | 1987 | 186,161 | | 1986 | 177,111 | | 1985 | 166,983 | | 1984 | 157,131 | | 1983 | 149,149 | | 1982 | 143,452 | | 1981 | 138,989 | | 1980 | 135,369 | | 1979 | 130,763 | | 1978 | 124,900 | | 1977 | 118,702 | | 1976 | 112,009 | | 1975 | 104,320 | | 1974 | 94,956 | | 1973 | 84,849 | | 1972 | 77,723 | | 1971 | 76,336 | | 1970 | 78,676 | | 1969 | 84,548 | | 1968 | 94,485 | | 1967 | 103,732 | | 1966 | 107,639 | | 1965 | 107,449 | | 1964 | 105,795 | | 1963 | 100,977 | | 1962 | 93,791 | | 1961 | 87,880 | | 1960 | 84,572 |
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