Year	constant 2015 US$
1995	5533.347705506496
1996	6034.62602826095
1997	6513.081320936791
1998	6755.604505641537
1999	6523.7364299446335
2000	6663.534388013778
2001	7148.479728874422
2002	7821.742579952541
2003	7980.82855719039
2004	8606.411961966263
2005	9327.878034210029
2006	9797.949853976661
2007	10354.272762065799
2008	10594.9131412776
2009	9596.454778976487
2010	9659.393032926453
2011	9526.117721505956
2012	9222.293946244783
2013	9350.509612686592
2014	9348.624145898882
2015	9996.732776988438
2016	10334.13544662676
2017	11112.888265601854
2018	11670.256863435614
2019	12184.26268920492
2020	10942.000199856308
2021	12665.099999811237