Year | Value | 2021 | 31,268 | 2020 | 138,898 | 2019 | 425,475 | 2018 | 404,301.32801322 | 2017 | 496,322 | 2016 | 458,222 | 2015 | 400,758 | 2014 | 303,024 | 2013 | 401,712 | 2012 | 316,620.85 | 2011 | 130,197.6 | 2010 | 25,969.382364616 | 1998 | 20,800 | 1997 | 20,900 | 1996 | 14,700 | 1995 | 14,700 | 1994 | 14,000 | 1993 | 14,000 | 1992 | 14,000 | 1991 | 14,000 | 1990 | 14,000 | 1989 | 14,000 | 1988 | 27,600 | 1987 | 13,700 | 1986 | 13,700 | 1985 | 13,700 | 1984 | 13,400 | 1983 | 13,300 | 1982 | 13,300 | 1981 | 13,300 | 1980 | 13,300 | 1979 | 13,000 | 1978 | 12,000 | 1977 | 12,000 | 1976 | 11,000 | 1975 | 10,500 | 1974 | 10,000 | 1973 | 9,500 | 1972 | 9,000 | 1971 | 8,500 |
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