Year | Value | 2022 | 263,054 | 2021 | 264,894 | 2020 | 267,716 | 2019 | 268,685 | 2018 | 268,054 | 2017 | 266,830 | 2016 | 265,492 | 2015 | 264,118 | 2014 | 263,829 | 2013 | 265,187 | 2012 | 267,596 | 2011 | 269,992 | 2010 | 270,363 | 2009 | 271,412 | 2008 | 275,893 | 2007 | 281,092 | 2006 | 286,201 | 2005 | 293,655 | 2004 | 302,573 | 2003 | 311,650 | 2002 | 322,711 | 2001 | 335,322 | 2000 | 348,582 | 1999 | 360,599 | 1998 | 368,428 | 1997 | 372,210 | 1996 | 374,427 | 1995 | 374,769 | 1994 | 373,980 | 1993 | 373,581 | 1992 | 373,289 | 1991 | 372,982 | 1990 | 372,278 | 1989 | 372,761 | 1988 | 375,768 | 1987 | 379,993 | 1986 | 382,409 | 1985 | 381,318 | 1984 | 377,935 | 1983 | 372,577 | 1982 | 365,165 | 1981 | 357,819 | 1980 | 350,304 | 1979 | 344,632 | 1978 | 340,809 | 1977 | 338,028 | 1976 | 336,551 | 1975 | 335,630 | 1974 | 335,035 | 1973 | 333,722 | 1972 | 331,153 | 1971 | 326,967 | 1970 | 322,577 | 1969 | 320,744 | 1968 | 322,146 | 1967 | 324,613 | 1966 | 326,502 | 1965 | 327,089 | 1964 | 325,074 | 1963 | 320,086 | 1962 | 315,071 | 1961 | 312,619 | 1960 | 315,218 |
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