Year	constant 2015 US$
1989	4448.824784855256
1990	4591.458404456663
1991	4747.52475701909
1992	4827.190224811091
1993	4868.5615373502305
1994	5094.204233731603
1995	5033.961484986087
1996	5172.807413988733
1997	5379.210473937445
1998	5368.696767085714
1999	5218.0147462141485
2000	5300.376874983357
2001	5233.5742350155315
2002	5183.85917277064
2003	5173.251753587566
2004	5322.135664675556
2005	5382.24139080106
2006	5741.057570268827
2007	6031.376907484131
2008	6135.794856573723
2009	5927.465394210408
2010	6248.565460353626
2011	6434.760936269482
2012	6418.860724427079
2013	6564.523709449048
2014	6573.88249668674
2015	6556.889752828711
2016	6434.550542996757
2017	6597.2819502291195
2018	6546.918808436269
2019	6541.711608330581
2020	6058.08680680233
2021	6250.651527407087