Year | Value | 2021 | 431,310 | 2020 | 429,420 | 2019 | 427,530 | 2018 | 425,640 | 2017 | 423,750 | 2016 | 421,860 | 2015 | 419,960 | 2014 | 418,070 | 2013 | 416,180 | 2012 | 414,290 | 2011 | 412,400 | 2010 | 410,510 | 2009 | 410,454 | 2008 | 408,210 | 2007 | 405,970 | 2006 | 404,660 | 2005 | 403,920 | 2004 | 396,910 | 2003 | 407,260 | 2002 | 396,840 | 2001 | 393,090 | 2000 | 386,650 | 1999 | 376,500 | 1998 | 376,500 | 1997 | 376,500 | 1996 | 366,500 | 1995 | 354,190 | 1994 | 352,700 | 1993 | 331,600 | 1992 | 322,530 | 1991 | 321,430 | 1990 | 321,280 | 1989 | 321,230 | 1988 | 321,230 | 1987 | 321,060 | 1986 | 321,060 | 1985 | 321,030 | 1984 | 320,830 | 1983 | 320,830 | 1982 | 320,830 | 1981 | 320,830 | 1980 | 320,800 | 1979 | 320,800 | 1978 | 320,750 | 1977 | 320,750 | 1976 | 320,770 | 1975 | 318,780 | 1974 | 318,280 | 1973 | 317,780 | 1972 | 317,780 | 1971 | 317,780 | 1970 | 317,780 | 1969 | 317,280 | 1968 | 317,280 | 1967 | 317,280 | 1966 | 317,220 | 1965 | 317,180 | 1964 | 317,130 | 1963 | 317,080 | 1962 | 317,030 | 1961 | 316,980 |
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