Year	constant 2015 US$
1991	310.17630654261836
1992	313.81599169527
1993	339.30258047674397
1994	336.00587270744376
1995	352.8948256558556
1996	392.58410355252585
1997	373.1450676584893
1998	429.16803067576774
1999	428.94166026408317
2000	400.41724545398733
2001	425.9234967864502
2002	415.55259160867644
2003	446.6854515170513
2004	421.04590353616214
2005	469.32228760381565
2006	471.1324416486118
2007	439.75240890746414
2008	505.0281728753956
2009	449.2455177429928
2010	508.8969445155021
2011	492.5701580825893
2012	528.6714353437417
2013	557.6331369993969
2014	577.0528388217131
2015	546.4747197887069
2016	555.9878380331867
2017	541.7970125090885
2018	574.1922767916175
2019	558.522093575137
2020	550.340567733218
2021	493.30618467527825
2022	504.6828025522594