Year	constant 2015 US$
1995	1968.4651723500663
1996	1945.9390186637752
1997	2001.29934298134
1998	1890.0972131448539
1999	1894.8875125585766
2000	1938.841358441756
2001	1978.4118388184029
2002	2203.0895636585947
2003	2179.5039269066083
2004	2419.8303154125374
2005	2553.9010696493897
2006	2810.975459988078
2007	3205.0537560240796
2008	3309.642949048211
2009	3412.94480004697
2010	3646.319131034078
2011	3779.180806914141
2012	3958.6122977869018
2013	4082.473935830476
2014	4232.237184487797
2015	4360.163349715451
2016	4516.369261018424
2017	4723.823773398842
2018	4840.762849152816
2019	4952.628175379875
2020	4790.205378606833
2021	5053.193451112863