Year	current US$
2000	29.39907382
2001	37.14832924
2002	41.45907988
2003	46.28002009
2004	45.56673868
2005	49.27924003
2006	55.26335844
2007	55.79470209
2008	53.91693399
2009	54.77177961
2010	55.91468251
2011	75.28107844
2012	78.97285259
2013	87.22281737
2014	83.29487227
2015	94.81533051
2016	101.23426478
2017	104.88337054
2018	108.73709049
2019	109.9231493
2020	105.8052644