Year	current US$
2000	12.105242586571567
2001	11.495149359368037
2002	11.583742010975179
2003	18.28239934762994
2004	19.205616371395728
2005	23.659065102607954
2006	30.279450868991592
2007	32.779890637044716
2008	36.223810160362774
2009	33.054668131391495
2010	36.96156903801682
2011	39.42024985143037
2012	41.46978403976648
2013	44.6840946622064
2014	46.50964283427705
2015	44.69104342587236
2016	41.97708213587564
2017	39.629630627365216
2018	36.86578506776764
2019	35.930317450596526
2020	36.98863654208139
2021	45.57714607230154