Year | Value | 2022 | 331,888 | 2021 | 323,893 | 2020 | 318,340 | 2019 | 314,287 | 2018 | 309,604 | 2017 | 304,795 | 2016 | 300,363 | 2015 | 297,381 | 2014 | 297,878 | 2013 | 301,167 | 2012 | 305,493 | 2011 | 310,072 | 2010 | 312,363 | 2009 | 310,773 | 2008 | 309,050 | 2007 | 310,123 | 2006 | 312,750 | 2005 | 317,064 | 2004 | 322,901 | 2003 | 325,402 | 2002 | 321,322 | 2001 | 312,989 | 2000 | 303,115 | 1999 | 293,382 | 1998 | 286,692 | 1997 | 284,507 | 1996 | 285,073 | 1995 | 286,602 | 1994 | 286,886 | 1993 | 286,727 | 1992 | 287,071 | 1991 | 286,827 | 1990 | 287,811 | 1989 | 291,938 | 1988 | 298,513 | 1987 | 306,328 | 1986 | 315,360 | 1985 | 323,499 | 1984 | 328,247 | 1983 | 328,193 | 1982 | 322,140 | 1981 | 309,445 | 1980 | 292,111 | 1979 | 274,733 | 1978 | 259,199 | 1977 | 246,170 | 1976 | 237,627 | 1975 | 232,142 | 1974 | 226,277 | 1973 | 220,835 | 1972 | 218,507 | 1971 | 218,597 | 1970 | 220,037 | 1969 | 222,229 | 1968 | 225,885 | 1967 | 229,897 | 1966 | 232,866 | 1965 | 236,334 | 1964 | 240,977 | 1963 | 246,390 | 1962 | 252,426 | 1961 | 260,403 | 1960 | 270,762 |
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