| Year | Value | | 2021 | 133,708 | | 2020 | 409,104 | | 2019 | 1,700,293 | | 2018 | 1,670,216 | | 2017 | 1,557,876 | | 2016 | 1,402,765 | | 2015 | 1,336,976 | | 2014 | 1,243,824 | | 2013 | 1,161,936 | | 2012 | 1,225,268.5618857 | | 2011 | 1,276,205.48 | | 2010 | 1,259,009 | | 2009 | 1,146,591 | | 2008 | 946,138 | | 2007 | 960,546 | | 2006 | 932,394 | | 2005 | 870,571 | | 2004 | 836,719 | | 2003 | 972,000 | | 2002 | 715,000 | | 2001 | 612,727 | | 2000 | 586,043 | | 1999 | 549,800 | | 1998 | 516,200 | | 1997 | 516,900 | | 1996 | 479,600 | | 1995 | 494,500 | | 1994 | 464,600 | | 1993 | 424,200 | | 1992 | 426,000 | | 1991 | 413,700 | | 1990 | 433,400 | | 1989 | 458,800 | | 1988 | 382,000 | | 1987 | 309,700 | | 1986 | 313,400 | | 1985 | 320,200 | | 1984 | 324,800 | | 1983 | 309,300 | | 1982 | 330,000 | | 1981 | 319,300 | | 1980 | 322,000 | | 1979 | 310,000 | | 1978 | 280,000 | | 1977 | 305,000 | | 1976 | 313,000 | | 1975 | 300,000 | | 1974 | 296,200 | | 1973 | 257,100 |
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