Year	current US$
2000	18.38492733
2001	18.49326641
2002	15.13878894
2003	11.12837113
2004	21.90484027
2005	34.32975226
2006	42.97685234
2007	59.49875388
2008	78.96501998
2009	69.0947387
2010	76.86477594
2011	76.77762867
2012	97.5451943
2013	99.46616615
2014	95.52592252
2015	72.17015831
2016	69.79750078
2017	76.08842241
2018	78.24994392
2019	73.79609046
2020	67.05280063
2021	76.21366781