Year	2007 US$
1973	96570000
1974	205100000
1975	170000000
1976	186400000
1977	110900000
1978	132000000
1979	121500000
1980	129800000
1981	111400000
1982	98590000
1983	81200000
1984	100000000
1985	122300000
1986	34100000
1987	56250000
1988	123600000
1990	8710000
1991	117800000
1992	85630000
1993	86790000
1994	93270000
1995	82470000
1998	106600000
1999	126400000
2000	104800000
2001	117700000
2002	106800000
2003	111200000
2004	110200000
2005	108100000
2006	142000000
2007	131900000