Year | Value | 2021 | 349,000.37 | 2020 | 299,967.9354 | 2019 | 533,290.3 | 2018 | 581,319.96448969 | 2017 | 520,216 | 2016 | 426,687 | 2015 | 412,495 | 2014 | 437,496.15104079 | 2013 | 430,081.81523862 | 2012 | 376,331.92986924 | 2011 | 379,240.94949176 | 2010 | 331,174.83444304 | 2009 | 198,073 | 2008 | 181,228 | 2007 | 213,090 | 2006 | 184,038 | 2005 | 183,126 | 2004 | 176,521 | 2003 | 156,369 | 2002 | 153,359 | 2001 | 161,861 | 2000 | 167,795 | 1999 | 159,200 | 1998 | 182,300 | 1997 | 184,700 | 1996 | 195,600 | 1995 | 185,000 | 1994 | 193,400 | 1993 | 183,800 | 1992 | 192,600 | 1991 | 198,400 | 1990 | 208,400 | 1989 | 209,300 | 1988 | 223,800 | 1987 | 222,000 | 1986 | 228,600 | 1985 | 233,000 | 1984 | 233,200 | 1983 | 241,100 | 1982 | 232,000 | 1981 | 235,300 | 1980 | 225,400 | 1979 | 210,100 | 1978 | 193,800 | 1977 | 187,300 | 1976 | 211,000 | 1975 | 189,900 | 1974 | 170,500 | 1973 | 178,100 | 1972 | 167,600 | 1971 | 173,200 | 1970 | 168,900 |
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