Year | Value | 2021 | 371,452.766 | 2020 | 283,689.118 | 2019 | 545,738.122 | 2018 | 544,673.44454374 | 2017 | 536,379.38 | 2016 | 528,016 | 2015 | 523,455 | 2014 | 533,306.45263012 | 2013 | 556,736.09 | 2012 | 519,697.50053716 | 2011 | 543,909.40123806 | 2010 | 488,403.85218271 | 2009 | 404,042 | 2008 | 408,405 | 2007 | 394,482 | 2006 | 405,791 | 2005 | 375,959 | 2004 | 349,270 | 2003 | 320,117 | 2002 | 380,683 | 2001 | 444,450 | 2000 | 356,575 | 1999 | 336,700 | 1998 | 283,900 | 1997 | 294,000 | 1996 | 291,500 | 1995 | 282,000 | 1994 | 325,000 | 1993 | 314,300 | 1992 | 370,600 | 1991 | 318,200 | 1990 | 335,600 | 1989 | 380,100 | 1988 | 374,600 | 1987 | 357,200 | 1986 | 362,100 | 1985 | 363,700 | 1984 | 391,700 | 1983 | 364,100 | 1982 | 348,700 | 1981 | 354,900 | 1980 | 359,200 | 1979 | 349,600 | 1978 | 292,700 | 1977 | 284,800 | 1976 | 278,300 | 1975 | 261,900 | 1974 | 226,300 | 1973 | 244,200 | 1972 | 229,300 | 1971 | 220,700 | 1970 | 219,700 |
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