Year	constant 2015 US$
1991	211.5075318386995
1992	258.65927380666903
1993	260.6495078751533
1994	259.483109163105
1995	250.20185114720428
1996	242.98334892239478
1997	239.0324788130969
1998	282.38313452889713
1999	312.1550719349977
2000	306.5830118317081
2001	358.2354335607583
2002	261.5347790740262
2003	282.86793025376636
2004	292.8365489393494
2005	312.28698376205324
2006	293.4617829145897
2007	312.3521241388645
2008	386.0882798252949
2009	413.1172069165558
2010	391.48516149017826
2011	372.94884052303456
2012	407.94795983352344
2013	454.5126094679239
2014	382.5697653309399
2015	387.40878427897064
2016	594.3220240266094
2017	468.7666053880174
2018	401.91912255269744
2019	401.3824858117361
2020	462.35491392459573
2021	508.93843977102557
2022	505.2100281034682