Year	constant 2015 US$
1996	21549281379.12138
1997	22845341854.731373
1998	23087338520.45269
1999	24518935850.033943
2000	24019647401.07318
2001	24340051108.8612
2002	23507495729.810883
2003	22768176071.125023
2004	23136363318.512436
2005	23575434058.681786
2006	23658776843.75688
2007	24681926851.063606
2008	24269886110.047024
2009	24854928657.74055
2010	25770732821.245018
2011	24074563230.598034
2012	27324714177.567135
2013	28669235165.03912
2014	31288830022.831924
2015	34185724112.651104
2016	36296271737.59998
2017	38623372947.65431
2018	40888165738.70894
2019	43105997249.322365
2020	43719176103.16714
2021	46088495550.4049
2022	48509036534.260704
2023	50700685337.995575