Year	constant 2015 US$
1995	3996.0072059414915
1996	4106.177672851151
1997	4112.492196034977
1998	4132.2082482166
1999	4171.930309691189
2000	4174.907020367764
2001	4137.830973501412
2002	3619.416833244462
2003	3740.4311280840334
2004	3660.792196274009
2005	3524.031050260868
2006	3396.7514017660055
2007	3250.8137939159683
2008	3047.1352155367554
2009	2760.1207339072535
2010	2515.0535926095536
2011	2258.397697731478
2012	2058.7728765854336
2013	2290.6484437965933
2014	2599.5721448166396
2015	2886.953807055245
2016	2811.9288863435277
2017	2749.2572224916757
2018	2578.2734799180344
2019	2493.3584791272215
2020	2324.045028184317
2021	2309.7521078539194
2022	2133.979270760644