Year | Value | 2022 | 316,670 | 2021 | 317,538 | 2020 | 318,464 | 2019 | 318,725 | 2018 | 318,787 | 2017 | 318,854 | 2016 | 318,810 | 2015 | 318,773 | 2014 | 318,620 | 2013 | 318,335 | 2012 | 318,151 | 2011 | 318,002 | 2010 | 317,741 | 2009 | 317,338 | 2008 | 316,886 | 2007 | 316,585 | 2006 | 316,447 | 2005 | 316,347 | 2004 | 316,162 | 2003 | 315,676 | 2002 | 314,222 | 2001 | 312,711 | 2000 | 311,220 | 1999 | 311,512 | 1998 | 312,017 | 1997 | 312,590 | 1996 | 313,045 | 1995 | 313,111 | 1994 | 312,702 | 1993 | 311,802 | 1992 | 310,569 | 1991 | 309,473 | 1990 | 308,801 | 1989 | 308,735 | 1988 | 309,082 | 1987 | 309,456 | 1986 | 309,321 | 1985 | 308,272 | 1984 | 306,110 | 1983 | 303,022 | 1982 | 299,428 | 1981 | 295,852 | 1980 | 292,619 | 1979 | 289,957 | 1978 | 287,792 | 1977 | 285,830 | 1976 | 283,634 | 1975 | 280,933 | 1974 | 277,477 | 1973 | 273,464 | 1972 | 269,584 | 1971 | 266,729 | 1970 | 265,395 | 1969 | 265,996 | 1968 | 268,282 | 1967 | 271,213 | 1966 | 273,302 | 1965 | 273,507 | 1964 | 271,422 | 1963 | 267,405 | 1962 | 262,119 | 1961 | 256,528 | 1960 | 251,232 |
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