Year	constant 2015 US$
1991	11063.33488744476
1992	11481.49750765119
1993	11928.565501694806
1994	12270.869243998555
1995	13118.379128293198
1996	12858.04170104369
1997	13158.279963379302
1998	13789.721096346779
1999	14200.446761714804
2000	15666.388097977326
2001	15629.644487347196
2002	15588.470744210481
2003	15886.25585113277
2004	16059.239221208407
2005	16573.014482030274
2006	17934.00089012094
2007	18766.630888517422
2008	19108.06485567763
2009	18743.52636616114
2010	18949.51102193629
2011	19545.855309379618
2012	20119.38329194983
2013	19953.003975084805
2014	20544.251041885167
2015	20882.043554048156
2016	21932.88581548141
2017	21942.252968128236
2018	22453.24094914137
2019	22536.206710851697
2020	21051.570136412887
2021	21898.32871128385
2022	22348.71303991256