Year	constant 2021 international $
1990	10612.966664584857
1991	10399.393116643743
1992	7928.372295229395
1993	6005.197797095324
1994	4757.584412795696
1995	4147.974691078832
1996	4159.597892299096
1997	4358.604800190619
1998	4749.174440779685
1999	5056.046340192112
2000	5571.309502498523
2001	6075.614523861322
2002	6599.657605945233
2003	7218.471885546604
2004	7817.716106749247
2005	9901.926629660462
2006	13172.581293960342
2007	16280.083507883031
2008	17656.963450961106
2009	18901.885760900135
2010	19621.38434511771
2011	19386.743401325282
2012	19545.071857666764
2013	20414.831483661794
2014	20716.14152292688
2015	20694.778755035586
2016	19830.32231763075
2017	19675.959890826372
2018	19798.83353871459
2019	20122.712852450903
2020	19126.09490313499
2021	20111.375695210878
2022	21051.268761928895
2023	21349.350470438774