Year	constant 2015 US$
1995	1620.0181351303834
1996	1445.4294390981886
1997	1477.121451545357
1998	1235.0580939025187
1999	1226.8251963315793
2000	1207.2121915170055
2001	1268.0808961754776
2002	1689.9833228929626
2003	1562.7653073100464
2004	1911.008752919852
2005	2054.476235506015
2006	2358.740429631038
2007	2934.1479041799084
2008	3072.062373154789
2009	3423.5934400350666
2010	3670.491625701105
2011	3812.1380925417084
2012	4141.718644158095
2013	4343.384887484893
2014	4644.391422756408
2015	4937.413484537659
2016	5257.67843922422
2017	5570.615037177178
2018	5766.4375474184035
2019	5979.680269756801
2020	5930.415118644965
2021	6305.220382774918