Year	current US$
2001	870793380.947611
2002	1164328391.14337
2003	1247765024.30138
2004	1411416180.99135
2005	2227990130.33445
2006	2700028187.62602
2007	2653172495.53196
2008	4616054588.2961
2009	2546527812.72641
2010	4476415399.55777
2011	6377130938.61076
2012	7069495033.68538
2013	6884396950.35646
2014	6403005624.25617
2015	4720039322.67629
2016	4386729509.58983
2017	4408934459.97747
2018	4128981082.98513
2019	4251677431.54165
2020	3845156397.71862
2021	3381548818.59011