Year	constant 2015 US$
1990	21936295766.435127
1991	22163714202.091595
1992	19435608154.009224
1993	18190005783.4041
1994	14914559125.423199
1995	12603607030.903286
1996	13161541390.079248
1997	14679281292.561668
1998	16165682365.213123
1999	16376665655.606382
2000	17856981105.40093
2001	19782950116.687355
2002	21148255223.875782
2003	23290663208.982376
2004	26309302839.151215
2005	29550907990.733757
2006	34533013621.445946
2007	39001186231.51515
2008	46391035591.78786
2009	45867640847.46588
2010	51282974640.69083
2011	53152230598.651344
2012	54450544185.40968
2013	59066761555.58828
2014	59099085907.673325
2015	54667245175.96708
2016	51733832530.624054
2017	54263122371.078545
2018	56307884051.84645
2019	59046001572.83706
2020	57489011537.55313
2021	57886262998.420425
2022	55440692025.42087
2023	59866965974.226425