Year	current US$
2000	3521418059.923445
2001	2813571753.8725324
2002	3825701438.9996333
2003	4520946818.545814
2004	5224896718.67782
2005	6203256538.709669
2006	6971758282.293506
2007	9747886187.393929
2008	10109297047.543194
2009	12416152732.056717
2010	15856668555.833595
2011	17805098206.314083
2012	19907329777.587166
2013	20146416757.598675
2014	20497128555.69723
2015	19134221644.732494
2016	18116572395.077213
2017	18753456497.815865
2018	18053222687.412624
2019	18799444490.11278
2020	19955929052.149597
2021	14266499429.874573
2022	14502158192.090395