Year	constant 2015 US$
1999	7314544822.573734
2000	6978075761.62593
2001	7871269458.228022
2002	7939132137.787391
2003	8869836096.01967
2004	9195643299.027681
2005	9462035206.461256
2006	10282395063.892054
2007	10488961618.715899
2008	10128580508.858654
2009	12504661848.724201
2010	13292889916.093231
2011	14584983657.496595
2012	16002717540.329714
2013	17922602343.51413
2014	18464893962.63763
2015	19748333505.195023
2016	20065283845.945457
2017	19246308533.66839
2018	19874150547.710625
2019	20382972119.884624
2020	20957435978.681465
2021	20494545531.06848
2022	21553580082.762466
2023	22244746311.46425