Year	constant 2015 US$
1995	13375.45838154295
1996	13878.707247185612
1997	14584.928737657341
1998	15161.6782576217
1999	16015.402546254414
2000	16246.82107898856
2001	16923.108726390634
2002	17526.93485312289
2003	18060.53087564623
2004	18652.57916203154
2005	19170.235397298136
2006	20072.857823300983
2007	21266.84318747225
2008	21728.716618581104
2009	20502.698795905646
2010	20251.250148510033
2011	20195.130804364195
2012	19435.78970379115
2013	19347.668328188935
2014	20092.81957348128
2015	20245.863397193167
2016	21084.892212827297
2017	22169.892462706764
2018	23142.940476587297
2019	23836.21904482279
2020	22973.004589069657
2021	24232.046078009946
2022	23982.82856033742