Year	current international $
2000	3.96098601767248
2001	4.18432797496322
2002	4.84909559282261
2003	4.60298470508453
2004	4.92676835536137
2005	4.5054428330692
2006	4.52057507094398
2007	4.59992153283059
2008	4.62836960459092
2009	6.29097515437794
2010	7.27720326643643
2011	8.24999809765584
2012	7.49259304317852
2013	6.17216646195386
2014	6.87771579921179
2015	8.33495159758313
2016	9.10563794411255
2017	7.95938118612625
2018	8.73926632171086
2019	9.11498939425269
2020	9.46989500109987
2021	9.61150284414572