Year	current US$
1977	29998431.37101116
1978	71609411.76216839
1979	83992116.86289887
1980	80295726.27420223
1981	-16782231.400789034
1982	-32503657.817172557
1983	-57499966.66699999
1984	17374757.17643408
1985	25941586.719707757
1992	48326492.40607517
1993	78779665.89861752
1994	56023948.66232827
1995	114906975.35211273
1996	170606272.7920228
1997	131890728.99768962
1998	109399584.10566108
1999	88169767.63783863
2000	68362336.23855725
2001	47825004.34428455
2002	48485156.6884326
2003	83060420.60718565
2004	151967833.27660325
2005	144151565.9787367