Year	constant 2015 US$
1991	4050.9595428095463
1992	3808.97184962655
1993	3507.6572792619404
1994	3802.967584788325
1995	3540.9267929611397
1996	3629.5564317191597
1997	4443.481410895078
1998	4543.288118374849
1999	4649.715745848666
2000	4925.505844367286
2001	4908.518828391963
2002	4884.0169465068375
2003	5259.842521017121
2004	5048.069442819404
2005	4988.899200587516
2006	5701.324086283414
2007	5777.9574040774205
2008	5904.767827353293
2009	6098.5515787901595
2010	6201.314004657447
2011	6392.537448935092
2012	6299.100047702601
2013	6422.051244994233
2014	6842.649763006398
2015	6943.68014820154
2016	6811.8988763387615
2017	7352.539542982908
2018	7575.289716224785
2019	7639.9442688895315
2020	7250.145997696452
2021	7393.847145545535
2022	7482.540783898859