Year	constant 2015 US$
1996	2071.197039884359
1997	2164.035458153819
1998	2175.888543460965
1999	2168.0296937840385
2000	2276.0438950527387
2001	2341.7045577385343
2002	2485.3765358024816
2003	2649.5812685111227
2004	2907.594342117142
2005	3145.76764676724
2006	3401.406382722727
2007	3742.450923805043
2008	3991.7236557564947
2009	3825.7196028370918
2010	4018.750036750828
2011	4293.310578994525
2012	4485.5807804055385
2013	4661.13553502076
2014	4731.036386317901
2015	4615.234191775328
2016	4656.988976762758
2017	4875.470236390981
2018	5044.010127214716
2019	5202.847953291369
2020	5072.638438900867
2021	5582.866311790121
2022	5971.599057805428
2023	6392.824262285346