Year	2007 US$
1985	44520000
1986	36470000
1987	43190000
1988	33200000
1989	31760000
1990	21000000
1991	28930000
1992	40450000
1994	76640000
1995	120500000
1996	118000000
1998	133000000
1999	133900000
2000	187800000
2001	243400000
2002	340700000
2003	352000000
2004	350500000
2005	354100000
2006	468200000
2007	532500000