Year	U.S. dollars (Billions)
2002	4.367
2003	4.553
2004	5.146
2005	6.167
2006	6.925
2007	8.556
2008	10.297
2009	12.066
2010	15.325
2011	17.890
2012	20.293
2013	20.170
2014	20.616
2015	20.057
2016	18.020
2017	18.883
2018	18.336
2019	18.876
2020	20.136
2021	14.288
2022	14.467