Year	constant 2015 US$
2000	14147095648.860327
2001	14737130987.835497
2002	15502210784.057991
2003	16166572573.053913
2004	16750748798.406796
2005	17522763641.683655
2006	18029977737.352932
2007	19724986220.521553
2008	21072215864.88626
2009	19435072628.625477
2010	18987186389.277637
2011	19282151322.489697
2012	19320604573.199085
2013	19227888757.0797
2014	19809573278.472485
2015	20171643534.53262
2016	20895671485.89276
2017	21590159014.047127
2018	22127838005.502716
2019	22778690178.35068
2020	21925605162.93808
2021	23632995216.30946
2022	24082303180.280945
2023	24442890583.002365