Year	current US$
2000	9.03495451
2001	9.87728069
2002	10.73175951
2003	14.77905846
2004	17.51606116
2005	21.15232051
2006	32.15886501
2007	49.28891573
2008	53.65924334
2009	43.61072876
2010	46.90089518
2011	55.08590036
2012	51.83338807
2013	76.59731861
2014	62.4414667
2015	78.00809285
2016	66.68025641
2017	51.61192894
2018	23.78915719
2019	23.92625998
2020	12.36403293
2021	12.26999207