| Year | Value | | 2022 | 471,761 | | 2021 | 508,568 | | 2020 | 516,650 | | 2019 | 513,704 | | 2018 | 503,888 | | 2017 | 494,244 | | 2016 | 481,366 | | 2015 | 466,976 | | 2014 | 452,589 | | 2013 | 438,087 | | 2012 | 422,183 | | 2011 | 402,118 | | 2010 | 378,571 | | 2009 | 356,779 | | 2008 | 335,443 | | 2007 | 316,516 | | 2006 | 300,312 | | 2005 | 283,026 | | 2004 | 266,729 | | 2003 | 252,425 | | 2002 | 237,738 | | 2001 | 226,028 | | 2000 | 217,128 | | 1999 | 212,637 | | 1998 | 214,323 | | 1997 | 222,630 | | 1996 | 232,301 | | 1995 | 241,652 | | 1994 | 245,189 | | 1993 | 243,633 | | 1992 | 240,003 | | 1991 | 236,124 | | 1990 | 231,220 | | 1989 | 223,420 | | 1988 | 215,552 | | 1987 | 207,233 | | 1986 | 199,515 | | 1985 | 194,263 | | 1984 | 188,628 | | 1983 | 180,769 | | 1982 | 171,187 | | 1981 | 161,276 | | 1980 | 152,809 | | 1979 | 145,323 | | 1978 | 138,993 | | 1977 | 132,879 | | 1976 | 126,465 | | 1975 | 120,520 | | 1974 | 114,473 | | 1973 | 108,849 | | 1972 | 104,330 | | 1971 | 101,146 | | 1970 | 98,580 | | 1969 | 95,539 | | 1968 | 91,695 | | 1967 | 87,625 | | 1966 | 83,668 | | 1965 | 79,865 | | 1964 | 76,804 | | 1963 | 73,600 | | 1962 | 70,715 | | 1961 | 68,598 | | 1960 | 66,273 |
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