Year	current US$
2000	47.50006104
2001	45.25306702
2002	51.05594635
2003	63.81992722
2004	70.50469971
2005	67.78135681
2006	65.70906067
2007	69.87508392
2008	73.73594666
2009	69.42589569
2010	69.0898819
2011	80.95452881
2012	76.77297974
2013	81.4433136
2014	84.27106476
2015	60.86703491
2016	63.14864731
2017	74.52148438
2018	74.43584442
2019	77.80075073
2020	88.67053223
2021	99.03723907