Year	constant 2015 US$
1968	16724822304.589972
1969	18509184224.42935
1970	17077542746.492138
1971	18046810039.177124
1972	18906260313.541866
1973	20581048505.721954
1974	22278068045.70447
1975	20295144292.71842
1976	18685363328.836273
1977	18289844299.21929
1978	15974743556.17773
1979	15050161704.756792
1980	15579292647.693964
1981	15820699564.36516
1982	15579544588.799128
1983	16029187650.812037
1984	17309471064.448414
1985	18312549252.41496
1986	19094792089.107143
1987	19552426975.26425
1988	19115105226.221508
1989	18334560016.251053
1990	15649684706.419348
1991	12287542637.056946
1992	8901211542.044226
1993	7812748111.120805
1994	7232234749.451893
1995	8054629173.608456
1996	7829099396.729679
1997	6122355805.153752
1998	5240736357.365712
1999	6110698945.149292
2000	5444632715.933468
2001	4674923147.245563
2002	4876401316.554462
2003	4658657982.535729
2004	4859611469.112054
2005	4880026874.236557
2006	4646275638.994793
2007	4978714449.406638
2008	5057480533.215304
2009	4558180343.614143
2010	4407062958.628297
2011	4485746660.951756
2012	4719966048.559121
2013	5194493860.278915
2014	5710596358.537383
2015	6494794000.439495
2016	7056302915.424449
2017	7230908023.052551
2018	7169697783.075283
2019	7607946624.994495
2020	7059590203.327978
2021	7349868033.074019
2022	7528835915.9253235
2023	7725613762.089067