| Year | Value | | 2022 | 359,532 | | 2021 | 368,237 | | 2020 | 382,434 | | 2019 | 400,120 | | 2018 | 416,584 | | 2017 | 425,995 | | 2016 | 427,815 | | 2015 | 425,402 | | 2014 | 418,069 | | 2013 | 406,831 | | 2012 | 396,622 | | 2011 | 383,514 | | 2010 | 365,842 | | 2009 | 350,787 | | 2008 | 341,095 | | 2007 | 339,257 | | 2006 | 349,827 | | 2005 | 369,888 | | 2004 | 395,525 | | 2003 | 427,203 | | 2002 | 462,862 | | 2001 | 497,086 | | 2000 | 525,832 | | 1999 | 547,640 | | 1998 | 562,263 | | 1997 | 571,467 | | 1996 | 578,840 | | 1995 | 586,673 | | 1994 | 593,574 | | 1993 | 594,998 | | 1992 | 588,448 | | 1991 | 573,317 | | 1990 | 548,966 | | 1989 | 517,294 | | 1988 | 481,966 | | 1987 | 447,378 | | 1986 | 417,677 | | 1985 | 395,523 | | 1984 | 381,410 | | 1983 | 373,922 | | 1982 | 370,941 | | 1981 | 370,211 | | 1980 | 370,781 | | 1979 | 370,737 | | 1978 | 368,127 | | 1977 | 363,368 | | 1976 | 357,333 | | 1975 | 350,524 | | 1974 | 343,749 | | 1973 | 338,501 | | 1972 | 334,748 | | 1971 | 331,498 | | 1970 | 328,444 | | 1969 | 325,614 | | 1968 | 322,965 | | 1967 | 320,194 | | 1966 | 316,637 | | 1965 | 311,901 | | 1964 | 306,012 | | 1963 | 298,899 | | 1962 | 290,984 | | 1961 | 283,365 | | 1960 | 276,557 |
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