| Year | Value | | 2022 | 295,718 | | 2021 | 306,445 | | 2020 | 329,583 | | 2019 | 340,695 | | 2018 | 345,587 | | 2017 | 348,880 | | 2016 | 351,424 | | 2015 | 354,311 | | 2014 | 359,078 | | 2013 | 364,123 | | 2012 | 368,890 | | 2011 | 373,098 | | 2010 | 378,154 | | 2009 | 388,457 | | 2008 | 402,737 | | 2007 | 417,225 | | 2006 | 432,885 | | 2005 | 448,727 | | 2004 | 459,979 | | 2003 | 464,084 | | 2002 | 459,381 | | 2001 | 446,573 | | 2000 | 428,791 | | 1999 | 406,580 | | 1998 | 382,927 | | 1997 | 364,834 | | 1996 | 354,531 | | 1995 | 349,956 | | 1994 | 351,142 | | 1993 | 355,769 | | 1992 | 356,391 | | 1991 | 352,205 | | 1990 | 346,690 | | 1989 | 338,017 | | 1988 | 330,253 | | 1987 | 332,997 | | 1986 | 344,882 | | 1985 | 360,163 | | 1984 | 377,418 | | 1983 | 393,496 | | 1982 | 405,755 | | 1981 | 415,101 | | 1980 | 422,951 | | 1979 | 427,842 | | 1978 | 431,864 | | 1977 | 437,843 | | 1976 | 442,097 | | 1975 | 437,701 | | 1974 | 428,743 | | 1973 | 418,601 | | 1972 | 399,802 | | 1971 | 375,665 | | 1970 | 360,769 | | 1969 | 347,763 | | 1968 | 327,323 | | 1967 | 309,768 | | 1966 | 296,689 | | 1965 | 286,132 | | 1964 | 281,072 | | 1963 | 283,083 | | 1962 | 289,845 | | 1961 | 299,612 | | 1960 | 313,029 |
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