Year	constant 2015 US$
1991	1384.5463262805117
1992	1384.2380748973828
1993	1378.61502454419
1994	1378.641008868229
1995	1393.1025055185535
1996	1414.5191432777701
1997	1442.3220531615605
1998	1474.1262686583275
1999	1522.3687868976926
2000	1548.2825272204966
2001	1590.525259194228
2002	2447.478882447554
2003	2604.737524692775
2004	2777.0708853590327
2005	2944.4374611424773
2006	3130.846208462437
2007	3334.00584654748
2008	3502.4571345555864
2009	3679.0292986231634
2010	3860.2337386905633
2011	3940.396045646297
2012	4224.042865085173
2013	4381.810126316473
2014	4501.0240967010695
2015	4580.741692208767
2016	4642.830000012586
2017	4669.295021374291
2018	4648.360603441824
2019	4645.890725690335
2020	4657.92477529584
2021	4613.401516694444
2022	4540.770789125443