| Year | Value | | 2021 | 2,437,207 | | 2020 | 1,249,361 | | 2019 | 7,068,458 | | 2018 | 7,404,373 | | 2017 | 6,993,888 | | 2016 | 6,866,472 | | 2015 | 6,331,198 | | 2014 | 5,886,728 | | 2013 | 5,565,864 | | 2012 | 5,381,980 | | 2011 | 5,151,469 | | 2010 | 5,084,798 | | 2009 | 4,605,452 | | 2008 | 4,563,041 | | 2007 | 4,662,615 | | 2006 | 4,357,151 | | 2005 | 4,392,448 | | 2004 | 4,968,931 | | 2003 | 3,677,879 | | 2002 | 3,708,138 | | 2001 | 3,967,140 | | 2000 | 4,442,967 | | 1999 | 4,033,200 | | 1998 | 3,698,500 | | 1997 | 3,753,600 | | 1996 | 3,694,600 | | 1995 | 3,453,400 | | 1994 | 2,980,400 | | 1993 | 2,569,400 | | 1992 | 2,391,200 | | 1991 | 2,047,500 | | 1990 | 2,004,000 | | 1989 | 2,118,000 | | 1988 | 1,894,600 | | 1987 | 2,009,700 | | 1986 | 1,828,600 | | 1985 | 1,802,700 | | 1984 | 1,669,400 | | 1983 | 1,578,700 | | 1982 | 1,480,800 | | 1981 | 1,585,200 | | 1980 | 1,483,300 | | 1979 | 1,584,000 | | 1978 | 1,519,700 | | 1977 | 1,454,100 | | 1976 | 1,299,800 | | 1975 | 1,053,700 | | 1974 | 1,214,300 | | 1973 | 1,163,500 | | 1972 | 1,137,100 | | 1971 | 1,057,400 | | 1970 | 485,000 |
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