| Year | Value | | 2021 | 2,550,505 | | 2020 | 1,989,284 | | 2019 | 1,659,671 | | 2018 | 4,525,805 | | 2017 | 2,443,630.512 | | 2016 | 634,292 | | 2015 | 510,342 | | 2014 | 517,548 | | 2013 | 643,140 | | 2012 | 776,864.1215957 | | 2011 | 901,116.11793797 | | 2010 | 917,939 | | 2009 | 484,394 | | 2008 | 520,303 | | 2007 | 528,226 | | 2006 | 509,792 | | 2005 | 480,266 | | 2004 | 444,691 | | 2003 | 356,369 | | 2002 | 352,544 | | 2001 | 641,142 | | 2000 | 643,332 | | 1999 | 582,600 | | 1998 | 753,600 | | 1997 | 755,000 | | 1996 | 755,000 | | 1995 | 716,700 | | 1994 | 682,600 | | 1993 | 633,100 | | 1992 | 648,800 | | 1991 | 633,900 | | 1990 | 679,000 | | 1989 | 679,100 | | 1988 | 987,800 | | 1987 | 408,800 | | 1986 | 436,200 | | 1985 | 422,000 | | 1984 | 395,500 | | 1983 | 363,700 | | 1982 | 400,200 | | 1981 | 364,500 | | 1980 | 379,900 | | 1979 | 416,500 | | 1978 | 270,000 | | 1977 | 255,000 | | 1976 | 248,300 | | 1975 | 219,700 | | 1974 | 263,000 | | 1973 | 250,000 | | 1972 | 232,000 | | 1971 | 217,900 | | 1970 | 203,400 |
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