Year	constant 2015 US$
1997	256535019.10680225
1998	138465712.0885169
1999	184878214.29328012
2000	220123979.35233855
2001	235575029.20856616
2002	188013940.1505178
2003	153640616.06556386
2004	230887939.83239147
2005	209796776.61322257
2006	244691279.65987915
2007	267789247.3467584
2008	301485101.4659406
2009	268295171.78605455
2010	280214706.31227094
2011	294368496.84606206
2012	278899345.7822075
2013	254388158.20075342
2014	296917967.4318437
2015	337921256.7610596
2016	372337016.9174156
2017	401623808.2779192
2018	405023540.8665798
2019	413124437.196099
2020	442043012.4845061
2021	459723650.46132773
2022	471216995.43908566
2023	474987218.53774977