Year	constant 2015 US$
1995	2531.320530275026
1996	2423.6895440310477
1997	2497.681943965528
1998	2295.5236406672007
1999	2266.2245452711277
2000	2278.2223841946848
2001	2334.283979803563
2002	2696.5875074763244
2003	2611.533762747446
2004	2945.441770622232
2005	3100.490553518246
2006	3452.666573936585
2007	4025.046124110185
2008	4163.577330673579
2009	4376.946538520034
2010	4670.443714715342
2011	4838.308203803477
2012	5089.361791571884
2013	5268.3540655433435
2014	5486.615166229112
2015	5662.523768538611
2016	5894.261562146044
2017	6174.101118070451
2018	6294.712861110358
2019	6448.072003671916
2020	6293.96577709521
2021	6680.050364634429