| Year | Value | | 2018 | 180,951.272 | | 2017 | 151,326 | | 2016 | 136,744 | | 2015 | 92,836 | | 2014 | 76,244 | | 2013 | 46,272 | | 2009 | 1,380,000 | | 2008 | 1,644,056 | | 2007 | 1,618,165 | | 2006 | 1,526,571 | | 2005 | 1,573,785 | | 2004 | 2,007,765 | | 2003 | 1,838,047 | | 2002 | 2,016,000 | | 2001 | 1,946,123 | | 2000 | 1,922,123 | | 1999 | 1,669,800 | | 1998 | 1,453,900 | | 1997 | 1,400,100 | | 1996 | 1,388,300 | | 1995 | 1,126,400 | | 1994 | 1,011,000 | | 1993 | 1,037,800 | | 1992 | 983,200 | | 1991 | 894,000 | | 1990 | 1,003,600 | | 1989 | 1,210,800 | | 1988 | 1,188,700 | | 1987 | 1,257,500 | | 1986 | 1,058,600 | | 1985 | 887,600 | | 1984 | 826,000 | | 1983 | 716,300 | | 1982 | 729,600 | | 1981 | 727,800 | | 1980 | 722,700 | | 1979 | 795,300 | | 1978 | 705,900 | | 1977 | 601,800 | | 1976 | 706,500 | | 1975 | 696,800 | | 1974 | 743,300 | | 1973 | 568,500 | | 1972 | 554,900 | | 1971 | 425,400 | | 1970 | 278,700 |
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