Year	constant 2015 US$
1997	3488.576859822053
1998	3558.5893231028144
1999	3585.360506099343
2000	3638.971868466049
2001	3839.9268613680015
2002	3899.009243152599
2003	3840.343444610281
2004	3826.364135461873
2005	3980.450449674882
2006	3960.012685872585
2007	4107.794889960252
2008	3875.6467939149707
2009	3945.9676089308314
2010	4005.2144563499896
2011	4026.9998486789946
2012	3929.256710095378
2013	4228.961562456633
2014	4380.130141736469
2015	4892.637294884315
2016	5033.650945153428
2017	5167.495449765529
2018	5512.559304262976
2019	6215.619008926177
2020	6221.79979796158
2021	5991.069780093461
2022	6062.34269964736