Year	current US$
1970	248834262.930521
1971	228679345.901047
1972	437590372.01361
1973	681436940.756487
1974	2553506014.53397
1975	2423301754.86082
1976	2979853641.0743
1977	3506651255.47793
1978	3909485694.34688
1979	9043086728.2716
1980	9121799851.00758
1981	7662514545.19965
1982	5338745615.65229
1983	5512635721.04358
1984	5805659262.28005
1985	5868810003.35179
1986	2761527290.59067
1987	4266705287.78931
1988	3579810605.4888
1989	5186309421.35079
1990	7317462890.97735
1991	4950272685.55955
1992	4934042042.15911
1993	4573925805.21785
1994	4151930365.48283
1995	4708890474.49087
1996	5950829312.22167
1997	5798958658.66332
1998	3968192811.73596
1999	5277977384.54138
2000	8619809364.56799
2001	7452326335.82911
2002	8027463709.72437
2003	10525981999.8044
2004	14720455238.3757
2005	22441246075.2166
2006	26707892212.2948
2007	28948058968.4171
2008	37379372981.2609
2009	20863670094.8342
2010	26031762993.6829
2011	36033566995.0019
2012	33665045736.1676
2013	30593656975.0497
2014	29522399343.6638
2015	14510204052.8792
2016	12263924261.5931
2017	15562261097.0979
2018	21452110253.9618
2019	18512528749.256
2020	10796014064.7997
2021	20390765287.7913