Year	current US$
1996	3673092010.5792
1997	4142128879.98851
1998	4699708358.31413
1999	5251925923.09737
2000	5835965603.15302
2001	6074964092.27412
2002	6658077170.60189
2003	6422184414.55023
2004	6176356912.67584
2005	6850054232.78842
2006	7671067408.01809
2007	9097061541.49644
2008	7138551272.35258
2009	8409295007.71364
2010	24700933959.8932
2011	30173337160.7061
2012	36382493455.6632
2013	39003961197.6108
2014	43881836572.6303
2015	34941378450.4673
2016	39565020176.0572
2017	45498139869.2646
2018	54385068830.4049
2019	57962497104.6959
2020	65985257463.6708
2021	66129471038.2759