Year	current US$
2000	10.4725818
2001	10.13398825
2002	12.36768998
2003	16.052264
2004	16.44278587
2005	23.8973666
2006	29.98735848
2007	35.19594445
2008	38.02713618
2009	39.83967868
2010	65.16624146
2011	81.63617201
2012	77.73003851
2013	72.7657907
2014	66.45329246
2015	58.21013883
2016	58.00709329
2017	58.91761258
2018	56.9831967
2019	60.79157043
2020	59.06702019
2021	61.91825647