Year	current US$
2000	14.61430931
2001	15.85929585
2002	17.47236824
2003	23.6236248
2004	30.63433456
2005	38.71856689
2006	57.64347458
2007	84.978302
2008	85.98817444
2009	83.10632324
2010	76.49365234
2011	83.55038452
2012	79.18972778
2013	102.35591125
2014	93.15203094
2015	98.24565125
2016	93.67060852
2017	71.14331818
2018	35.53091431
2019	35.51281357
2020	23.34439278
2021	21.58010864