Year	constant 2015 US$
1990	467.5521716385437
1991	514.8868206466984
1992	487.56702308155315
1993	494.31391307697976
1994	496.45244783334545
1995	487.1778282985414
1996	510.44035523983683
1997	522.3082730711114
1998	548.8249781508638
1999	567.3805017968252
2000	552.4304854690147
2001	595.2589296348011
2002	586.7602624951052
2003	637.8210540191751
2004	627.2938237413107
2005	647.0205880372203
2006	651.4275585158189
2007	652.8917391654375
2008	665.1644373613572
2009	663.5193358589435
2010	680.7778095036032
2011	682.041601665626
2012	655.2896452597207
2013	655.3978773411034
2014	684.3793154460926
2015	707.1750234680779
2016	721.3091758348579
2017	731.9551873284081
2018	745.5265974807805
2019	748.7084240099097
2020	713.2691101826422
2021	709.7605567565341
2022	716.1166417576881
2023	726.1146535298786