Year	constant 2015 US$
1990	13612.848361447248
1991	12393.425501587335
1992	11733.486523064379
1993	12095.909036700314
1994	12755.065189969504
1995	13276.073086570934
1996	13709.877425712712
1997	14421.575323424791
1998	14927.034496741688
1999	15711.816383060039
2000	16240.656886049459
2001	16736.666604882117
2002	17301.933807288315
2003	17803.377981898786
2004	18567.562205924503
2005	19239.399907821837
2006	20280.15190459574
2007	21574.753436010633
2008	22296.704996823148
2009	20428.16985952208
2010	20612.589530530822
2011	20746.988405299
2012	20157.0052544663
2013	19922.474290455022
2014	20453.833387718692
2015	20890.166430417266
2016	21541.176421948978
2017	22563.758939811836
2018	23483.529124564026
2019	24142.089570835942
2020	22963.933411023347
2021	24786.791207557173
2022	25349.75855335148
2023	25643.352291198964