Year	current US$
1976	311631981.21579546
1977	492225019.4914516
1978	522786391.98457277
1979	652020696.7905694
1980	490030700.23937863
1981	285996743.3193286
1982	279246185.64663774
1983	366251583.31983984
1984	456503650.8510057
1985	299139644.4257027
1986	408470957.10167074
1987	425971396.75661266
1988	670064192.9251114
1989	389881401.6332756
1990	551307531.5371462
1991	799981546.8255018
1992	907975173.0672905
1993	1267315630.2531133
1994	1544379347.3042958
1995	1629513273.9218633
1996	1351149931.78978
1997	732224467.9863034
1998	697567467.7760929
1999	656427712.4112355
2000	1143730186.6009665
2001	873426318.2560873
2002	688109542.9387503
2003	1077149267.887595
2004	1194686570.8554163