Year	current US$
1975	285784142.54903364
1976	104452997.62160203
1977	210621928.1070847
1978	304812802.2211392
1979	762959125.5447483
1980	1035782219.2718257
1981	1182292396.2694168
1982	1348718862.8129504
1983	1379428077.9615254
1984	1459217143.887481
1985	1417107318.7465677
1986	1517015850.429782
1987	1614681536.5767305
1988	1723936631.712181
1989	1647628266.8057473
1990	1903754105.0174806
1991	2125227675.972191
1992	2372744406.546958
1993	2648577276.233897
1994	2856666723.5940237
1995	2714290640.5074415
1996	3001986549.2054296
1997	3350804454.8714995
1998	3577126049.157037
1999	3661473384.7662168
2000	3609053739.14809
2001	3615214518.8003583
2002	3524145560.3177924
2003	4089064380.439287
2004	4570322896.531278
2005	5897075174.129354
2006	6415806145.264923
2007	7643263427.386452
2008	7341975300.516423
2009	10066395101.407082
2015	27282201089.067574
2016	30335028376.626526
2017	35188791629.172966
2018	33189770364.31168
2019	28514718606.49419
2020	26434205020.411423
2021	29241779059.70207
2022	20117292827.34984
2023	22968839494.195667