Year	constant 2015 US$
1997	3183.9628121217256
1998	3301.14273275896
1999	3001.491535466808
2000	3193.1518821405202
2001	3420.285881313678
2002	3626.0576665945514
2003	3785.6749015408323
2004	4128.528421614388
2005	4308.136349016016
2006	4512.068294710577
2007	4809.27374986873
2008	5122.854258534577
2009	5069.643614825734
2010	5095.749347203159
2011	5148.248571443529
2012	5170.129889380122
2013	5308.367839002262
2014	5252.582135367215
2015	5328.789006184293
2016	5484.549233119885
2017	5572.670960770873
2018	5940.979401998783
2019	6209.493562545079
2020	6347.688583294568
2021	6843.082898748763
2022	7118.770693866225
2023	7288.094933606641