Year	constant 2015 US$
1989	4522.521305727579
1990	4660.985282602697
1991	4827.256641570719
1992	4924.651364576984
1993	4973.679355772708
1994	5207.542351448542
1995	5167.783735740863
1996	5317.335247937842
1997	5532.872252174118
1998	5535.096619338971
1999	5382.000385385511
2000	5463.8457312470855
2001	5399.343750241848
2002	5351.170115145002
2003	5342.648233473091
2004	5499.035630116427
2005	5578.415799955641
2006	5936.48302241448
2007	6241.404008127978
2008	6347.508514697453
2009	6151.157774569749
2010	6496.145180088588
2011	6686.473878203238
2012	6697.077171843682
2013	6855.725673008266
2014	6867.701771210384
2015	6867.80922281565
2016	6755.5135428313
2017	6920.661107105289
2018	6880.376587958223
2019	6894.013905444637
2020	6376.07037169326
2021	6591.853621732921