Year | Value | 2022 | 322,000 | 2021 | 326,482 | 2020 | 328,868 | 2019 | 327,312 | 2018 | 324,992 | 2017 | 324,867 | 2016 | 325,680 | 2015 | 328,105 | 2014 | 332,242 | 2013 | 333,381 | 2012 | 328,684 | 2011 | 320,161 | 2010 | 310,004 | 2009 | 299,502 | 2008 | 291,689 | 2007 | 288,274 | 2006 | 287,552 | 2005 | 288,204 | 2004 | 288,650 | 2003 | 288,898 | 2002 | 288,986 | 2001 | 288,309 | 2000 | 289,130 | 1999 | 293,559 | 1998 | 300,558 | 1997 | 308,642 | 1996 | 317,862 | 1995 | 325,934 | 1994 | 329,710 | 1993 | 328,183 | 1992 | 321,176 | 1991 | 307,833 | 1990 | 289,910 | 1989 | 271,928 | 1988 | 256,076 | 1987 | 243,245 | 1986 | 235,027 | 1985 | 229,775 | 1984 | 224,073 | 1983 | 218,527 | 1982 | 215,783 | 1981 | 215,590 | 1980 | 217,428 | 1979 | 220,450 | 1978 | 224,316 | 1977 | 227,781 | 1976 | 230,282 | 1975 | 233,701 | 1974 | 238,406 | 1973 | 243,950 | 1972 | 250,378 | 1971 | 258,774 | 1970 | 268,428 | 1969 | 272,513 | 1968 | 271,144 | 1967 | 270,063 | 1966 | 266,378 | 1965 | 258,284 | 1964 | 254,891 | 1963 | 258,055 | 1962 | 261,085 | 1961 | 263,696 | 1960 | 266,107 |
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