| Year | Value | | 2021 | 2,719,206 | | 2020 | 1,786,407 | | 2019 | 5,630,289 | | 2018 | 4,908,235 | | 2017 | 4,423,249 | | 2016 | 3,686,938 | | 2015 | 3,634,598 | | 2014 | 3,067,724.4 | | 2013 | 3,087,143 | | 2012 | 3,593,312 | | 2011 | 3,659,209 | | 2010 | 3,733,253 | | 2009 | 3,268,022 | | 2008 | 3,253,417 | | 2007 | 3,003,872 | | 2006 | 2,047,466 | | 2005 | 1,707,714 | | 2004 | 1,337,781 | | 2003 | 1,255,313 | | 2002 | 959,487 | | 2001 | 1,137,305 | | 2000 | 1,218,102 | | 1999 | 980,300 | | 1998 | 907,600 | | 1997 | 995,200 | | 1996 | 913,300 | | 1995 | 1,244,900 | | 1994 | 1,242,700 | | 1993 | 979,400 | | 1992 | 918,900 | | 1991 | 1,148,900 | | 1990 | 1,322,000 | | 1989 | 1,271,700 | | 1988 | 1,322,500 | | 1987 | 1,281,300 | | 1986 | 1,240,400 | | 1985 | 1,215,800 | | 1984 | 1,163,400 | | 1983 | 998,600 | | 1982 | 919,400 | | 1981 | 1,079,700 | | 1980 | 1,112,100 | | 1979 | 1,119,700 | | 1978 | 1,084,600 | | 1977 | 1,077,100 | | 1976 | 912,600 | | 1975 | 613,100 | | 1974 | 674,400 | | 1973 | 611,800 | | 1972 | 488,800 | | 1971 | 429,400 | | 1970 | 452,500 |
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