Year	current US$
1970	22180000.923573934
1971	11170000.322163101
1972	19780000.096187003
1973	30229999.82163312
1974	24620000.1873076
1975	36369999.84085559
1976	49790000.08851288
1977	68790000.15743077
1978	54880000.08463859
1979	31039999.764412656
1980	42349999.4184822
1981	75079999.5139241
1982	34770000.02935534
1983	41509999.27520751
1984	12099999.776110046
1985	29169999.849051245
1986	29349999.98100102
1987	30240000.05796551
1988	19429999.94382262
1989	21469999.987632032
1990	1653050001.2524443
1991	4147219968.764112
1992	2542609972.275793
1993	1854709996.2010982
1994	2831610003.434122
1995	4596660105.62703
1996	2497579992.0242286
1997	2067120006.216691
1998	2712909990.6682982
1999	3141789979.1337547
2000	3344460002.0032372
2001	3388369997.9372334
2002	2525419992.554933
2003	3568569971.572607
2004	4582140026.284388
2005	114099998.96399675
2006	190499997.23024645
2007	156770001.68524677
2008	235310004.83781147
2009	165430002.3280082
2010	146259999.95507252
2011	280000.001192093