Year	constant 2015 US$
2000	18463833838.38632
2001	18747900789.76064
2002	21060660444.762604
2003	22346271434.09554
2004	23592614402.96681
2005	26994703867.845818
2006	31812516882.448257
2007	35723770259.029274
2008	36380041299.54975
2009	28419293187.746227
2010	29493485288.112522
2011	31154851204.292313
2012	32989180930.865246
2013	34240117268.631493
2014	32773455499.371704
2015	34053282278.46847
2016	37207818219.0662
2017	40751154398.67167
2018	44367977211.452675
2019	44777021273.76012
2020	42948596901.91995
2021	44071186818.85724
2022	46674159108.87753
2023	47174542314.411354