Year	current US$
2000	90.04831701
2001	103.62687593
2002	135.385394
2003	117.49009755
2004	141.98066234
2005	152.72642286
2006	128.6500042
2007	136.37458805
2008	144.13606623
2009	147.76080457
2010	139.07086331
2011	163.68092898
2012	164.7412115
2013	164.14744063
2014	161.72094721
2015	162.14591278
2016	156.23349662
2017	175.73595262
2018	178.60747088
2019	201.82169686
2020	193.04138697
2021	196.80996074