Year	constant 2015 US$
1985	33630000
1986	83190000
1987	35830000
1988	31830000
1989	42480000
1990	44230000
1991	36710000
1992	40450000
1993	34820000
1994	24530000
1995	30070000
1996	23560000
1997	34020000
1998	15230000
1999	-10240000