Year	current US$
2000	11.770401245913407
2001	13.142717462484532
2002	13.206781703774949
2003	14.1459190033247
2004	15.91323591223711
2005	17.91387379829378
2006	19.357127186611855
2007	22.810415440333205
2008	23.76707438985295
2009	23.114041687967084
2010	26.5452213210503
2011	27.57858281506974
2012	28.252052237825282
2013	34.141213918173946
2014	34.86651992421885
2015	35.40816169990027
2016	35.845581860864606
2017	31.04224667926937
2018	31.124161927406092
2019	31.882527442879343
2020	32.21760064259697
2021	36.908345409703365