Year	constant 2015 US$
1991	7569.598202828671
1992	7675.204286663275
1993	7825.538974461353
1994	7816.161209043442
1995	7711.762603180978
1996	7815.45204333162
1997	7985.668575873724
1998	8035.131373807887
1999	8200.899340750251
2000	8384.395023513052
2001	8537.780867435427
2002	8659.548619057736
2003	8802.563165156766
2004	9078.442866805686
2005	9469.253393203806
2006	9884.771190151954
2007	10619.48232200303
2008	11060.191408578808
2009	11314.060935286761
2010	11827.496838265843
2011	12246.540545523325
2012	12702.0679495453
2013	12937.657708282577
2014	13192.788424296512
2015	13452.511514081907
2016	13848.486931425245
2017	14345.763140012883
2018	14817.77013727333
2019	15196.666989609812
2020	15486.109340442445
2021	16107.83244942601
2022	16371.54253430086