Year	current US$
1971	7327913331.94127
1972	7913438766.5976
1973	10092143976.0132
1974	14182340850.596
1975	15372422185.6206
1976	17592992784.5699
1977	20378103570.0404
1978	23653992506.6934
1979	28169367198.4796
1980	33415440889.03
1981	36839007844.1127
1982	37932414447.8561
1983	33674477824.5681
1984	30766311979.538
1985	29981342776.2305
1986	29164758911.1833
1987	32839248511.4869
1988	37991734915.2346
1989	42928756297.7937
1990	45668192795.9917
1991	47404022481.024
1992	56056580303.5836
1993	57395771164.5038
1994	68414709178.9026
1995	79208058843.2962
1996	89581861777.4551
1997	90571146376.435
1998	78169985253.975
1999	89731686931.8723
2000	84581118725.3748
2001	79595599320.7617
2002	84849624884.4186
2003	87312273574.5341
2004	92704698231.3808
2005	105017715497.777
2006	123619733563.454
2007	148699594543.906
2008	176677586983.443
2009	175966969263.121
2010	206135924716.328
2011	230737385312.53
2012	262568198012.994
2013	287331942359.665
2014	299541131461.62
2015	311490681521.768
2016	323895918510.462
2017	333702122642.386
2018	350371847985.215
2019	375755437994.094
2020	350838234571.58
2021	361503537885.292