Year	constant 2015 US$
1989	3941.587198210122
1990	4003.642919519222
1991	3820.6535803986303
1992	4548.104675075381
1993	5194.405646028586
1994	4671.71221143873
1995	4343.205679424572
1996	4724.99889756815
1997	5216.570121031606
1998	4603.223107766176
1999	4377.816454527155
2000	3987.9476585947277
2001	4072.768398521806
2002	4022.356417031712
2003	4571.683653048422
2004	5040.913710205178
2005	4926.909794500414
2006	5027.181079665124
2007	5047.428596214909
2008	5058.387509050632
2009	5232.579115400577
2010	5249.133559370698
2011	5458.011266074246
2012	5856.017770410631
2013	6132.852572424515
2014	5835.084487478024
2015	6070.5070628339245
2016	5926.455750967471
2017	6144.619354538648
2018	6220.621173906897
2019	6533.107689129073
2020	6823.151291385202
2021	8252.226933138016
2022	8867.46310035843
2023	9778.480062024806