| Year | Value | | 2021 | 8,729,634.719 | | 2020 | 8,516,619.501 | | 2019 | 17,763,604.459 | | 2018 | 17,249,049.954137 | | 2017 | 16,271,523 | | 2016 | 15,300,409 | | 2015 | 14,385,078 | | 2014 | 13,618,711.999038 | | 2013 | 14,434,055.999195 | | 2012 | 13,937,353.943178 | | 2011 | 13,747,024.206969 | | 2010 | 13,295,185 | | 2009 | 12,104,116 | | 2008 | 12,950,904 | | 2007 | 12,545,766 | | 2006 | 12,382,205 | | 2005 | 11,951,935 | | 2004 | 11,305,401 | | 2003 | 12,259,437 | | 2002 | 11,285,424 | | 2001 | 11,467,023 | | 2000 | 10,781,314 | | 1999 | 9,565,600 | | 1998 | 8,654,900 | | 1997 | 9,435,400 | | 1996 | 9,597,000 | | 1995 | 7,676,600 | | 1994 | 7,716,100 | | 1993 | 6,290,800 | | 1992 | 5,784,400 | | 1991 | 5,370,800 | | 1990 | 5,865,600 | | 1989 | 5,723,500 | | 1988 | 5,093,600 | | 1987 | 4,812,300 | | 1986 | 4,527,300 | | 1985 | 4,158,600 | | 1984 | 3,764,900 | | 1983 | 3,222,000 | | 1982 | 3,073,900 | | 1981 | 3,316,100 | | 1980 | 3,497,500 | | 1979 | 3,807,300 | | 1978 | 3,399,500 | | 1977 | 3,198,500 | | 1976 | 3,023,200 | | 1975 | 3,047,400 | | 1974 | 2,961,300 | | 1973 | 2,544,400 | | 1972 | 2,084,300 | | 1971 | 1,923,800 | | 1970 | 1,862,000 |
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