| Year | Value | | 2013 | 33,444 | | 2012 | 181,742.61420249 | | 2011 | 363,857.37590431 | | 2010 | 303,692 | | 2001 | 46,364 | | 2000 | 77,273 | | 1999 | 83,900 | | 1998 | 90,500 | | 1997 | 85,500 | | 1996 | 75,100 | | 1995 | 74,100 | | 1994 | 69,200 | | 1993 | 68,200 | | 1992 | 66,300 | | 1987 | 4,000 | | 1986 | 69,000 | | 1985 | 61,000 | | 1984 | 70,000 | | 1983 | 77,000 | | 1982 | 79,000 | | 1981 | 71,000 | | 1980 | 71,000 | | 1979 | 66,000 | | 1978 | 57,000 | | 1977 | 61,400 | | 1976 | 59,400 | | 1975 | 50,500 | | 1974 | 49,800 | | 1973 | 46,900 | | 1972 | 44,000 | | 1971 | 39,000 | | 1970 | 39,200 |
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