| Year | Value | | 2021 | 1,695,302 | | 2020 | 816,253 | | 2019 | 3,478,444 | | 2018 | 3,383,805 | | 2017 | 3,381,677 | | 2016 | 3,181,283 | | 2015 | 3,065,145 | | 2014 | 3,211,795 | | 2013 | 3,294,911 | | 2012 | 3,438,356 | | 2011 | 3,267,109.7362049 | | 2010 | 3,077,036.6960894 | | 2009 | 2,323,750 | | 2008 | 2,355,285 | | 2007 | 2,246,212 | | 2006 | 2,046,457 | | 2005 | 1,737,165 | | 2004 | 1,660,235 | | 2003 | 1,353,444 | | 2002 | 1,299,699 | | 2001 | 1,178,058 | | 2000 | 1,281,997 | | 1999 | 1,252,200 | | 1998 | 1,186,700 | | 1997 | 1,353,400 | | 1996 | 1,299,200 | | 1995 | 1,270,000 | | 1994 | 1,219,500 | | 1993 | 1,185,600 | | 1992 | 1,109,300 | | 1991 | 797,200 | | 1990 | 963,900 | | 1989 | 1,204,000 | | 1988 | 1,225,900 | | 1987 | 1,178,000 | | 1986 | 1,132,000 | | 1985 | 1,310,200 | | 1984 | 1,327,600 | | 1983 | 1,457,300 | | 1982 | 1,667,300 | | 1981 | 1,443,300 | | 1980 | 1,112,600 | | 1979 | 914,300 | | 1978 | 728,400 | | 1977 | 557,300 | | 1976 | 475,500 | | 1975 | 379,900 | | 1974 | 243,400 | | 1973 | 162,300 | | 1972 | 119,900 | | 1971 | 119,600 | | 1970 | 118,800 |
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