Year	constant 2015 US$
1997	24186976686.245502
1998	24982206410.122955
1999	22632449775.52545
2000	24000834376.71937
2001	25663885951.283134
2002	27182821070.89472
2003	28319085597.392235
2004	30811855789.470375
2005	32055847393.531548
2006	33441505498.959774
2007	35500034117.28227
2008	37654116073.874535
2009	37113882462.92154
2010	37155330237.173615
2011	37242939842.43106
2012	37220163173.64898
2013	38029847903.166954
2014	37453936112.47822
2015	37809798925.066925
2016	38711714512.21321
2017	39124931496.29587
2018	41483506536.31431
2019	43126392022.86277
2020	43793503344.91072
2021	46767859375.074036
2022	47442684231.96607
2023	48232801761.07702