Year	constant 2015 US$
1990	345.6969181716752
1991	346.6293137939532
1992	317.7944687997118
1993	330.17894596462787
1994	326.1794728769678
1995	333.07386460187456
1996	312.51442681678355
1997	310.7882255351063
1998	309.3034002626046
1999	308.39857609661027
2000	294.15533501999926
2001	303.73734722992555
2002	308.1106662154851
2003	308.8791868558582
2004	308.85192700589704
2005	301.7025185144284
2006	302.52299816465484
2007	303.28561508682407
2008	292.4478343918449
2009	299.49929498860445
2010	307.32364102612513
2011	307.8829964096503
2012	318.47793495874413
2013	320.5785924054109
2014	314.9522357204092
2015	323.96258086046856
2016	341.61645825152436
2017	356.02882421229765
2018	365.30849662383014
2019	366.38398724354386
2020	371.58292443254254
2021	368.32702891346634
2022	376.12210251006815