Year	current US$
1976	14098511824.5925
1977	14887050111.8546
1978	13598247290.9942
1979	12901649733.2537
1980	12379017177.8778
1981	9989027577.44739
1982	9571954681.92935
1983	12433420053.8309
1984	8871569831.9113
1985	9547761978.04969
1986	9031816464.73232
1987	9351247189.38184
1988	13319591326.0328
1989	4123377719.13392
1990	10968359886.6679
1991	10338741140.3643
1992	12608140324.1866
1993	17604538045.8995
1994	15726416288.1197
1995	15374671991.333
1996	20410609138.8601
1997	18920193977.9247
1998	16304340085.7402
1999	5854094639.33363
2000	8009716019.9729
2001	6346462444.15068
2002	8054562567.9866
2003	13392470787.7958
2004	6082645145.68082
2005	8619185546.38028
2006	28872350839.3426
2007	38630968399.6308
2008	43213626289.0705
2009	24572822579.7976
2010	28415462780.9385
2011	35480122848.8409
2012	25288520888.9538
2013	17793993054.9176
2014	18405066827.3792
2015	13688354955.1889
2016	13531333615.5889
2017	15608431483.9111
2018	1205230516.40775
2019	8784112667.69176
2020	20996568265.7192
2021	49375088602.2193