Year	current US$
1966	40910000
1967	34930000
1968	49030000
1969	52270000
1970	56650000
1971	26922886.9338504
1972	35952613.8807368
1973	29113281.882156
1974	16758479.8547413
1975	31022694.3922206
1976	44534030.0461643
1977	47205471.072112
1978	52700057.3467262
1979	22839243.3389618
1980	3000000
1981	30003003.0064984
1982	78324323.5359275
1983	106496136.737262
1984	67907171.2167412
1985	27288400.7029877
1986	29205652.3919611
1987	54600000
1988	49300000
1989	14100000
1990	43986075.0309428
1991	58913407.4296585
1992	94420033.8251269
1993	146356315.89724
1994	321367624.521352
1995	458850278.567266
1996	528370205.282472
1997	633473685.829627
1998	725384316.016981
1999	763115699.754732
2000	808042388.803331
2001	983357418.978631
2002	934009575.937527
2003	1080256630.13831
2004	1308101595.45735
2005	1344201156.70341
2006	1810879485.55993
2007	2559789963.82403
2008	2300539404.85552
2009	2994459465.38175
2010	2706005010.33156
2011	2617450463.11354
2012	3167158060.13695
2013	3337539363.36545
2014	3316363815.2963
2015	2908876773.27382
2016	3097848069.80846
2017	3720863721.20488
2018	3358514649.90299