Year	constant 2015 US$
1990	5111.345329644297
1991	4735.927698089302
1992	4840.16858549117
1993	5008.349088863949
1994	5262.315235224959
1995	5628.4462389587625
1996	5968.114356721636
1997	6348.841217495636
1998	6641.085312327296
1999	6950.797735001386
2000	7344.120760595225
2001	7438.603435419032
2002	7593.559655226492
2003	7864.518263992031
2004	8261.227441447103
2005	8554.693897310322
2006	9084.949214462338
2007	9731.769454403553
2008	10139.119143726797
2009	10419.214870306268
2010	10755.656437274502
2011	11291.903586559185
2012	11466.415930000296
2013	11571.614848747777
2014	12024.609507099387
2015	12560.051419682035
2016	12936.57325683867
2017	13599.818019114751
2018	14408.384388722996
2019	15053.232367678449
2020	14774.989199307043
2021	15863.231107041378
2022	17178.668342845936
2023	17269.994172993906