| Year | Value | | 2021 | 4,311,879.56 | | 2020 | 2,627,202.201 | | 2019 | 4,066,959 | | 2018 | 4,122,113 | | 2017 | 4,053,427.35 | | 2016 | 3,678,739 | | 2015 | 4,115,271 | | 2014 | 3,563,043.5828127 | | 2013 | 2,027,888 | | 2012 | 2,206,069.7606697 | | 2011 | 2,125,912.5265979 | | 2010 | 1,781,340 | | 2009 | 1,537,032 | | 2008 | 1,718,196 | | 2007 | 1,744,663 | | 2006 | 1,443,165 | | 2005 | 1,892,343 | | 2004 | 1,824,313 | | 2003 | 1,770,774 | | 2002 | 1,508,700 | | 2001 | 1,557,128 | | 2000 | 1,756,608 | | 1999 | 1,872,600 | | 1998 | 2,115,500 | | 1997 | 2,250,800 | | 1996 | 1,783,500 | | 1995 | 1,223,700 | | 1994 | 1,175,200 | | 1993 | 1,117,000 | | 1992 | 1,214,400 | | 1991 | 1,200,000 | | 1990 | 1,237,600 | | 1989 | 1,272,600 | | 1988 | 1,266,700 | | 1987 | 1,232,600 | | 1986 | 1,300,700 | | 1985 | 1,343,300 | | 1984 | 1,359,500 | | 1983 | 1,299,000 | | 1982 | 1,160,100 | | 1981 | 1,220,300 | | 1980 | 1,342,000 | | 1979 | 1,225,500 | | 1978 | 1,015,600 | | 1977 | 862,300 | | 1976 | 744,700 | | 1975 | 652,500 | | 1974 | 475,000 | | 1973 | 375,700 | | 1972 | 379,000 | | 1971 | 331,100 | | 1970 | 244,000 |
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