Year	current US$
2000	33.75701439
2001	36.25112371
2002	40.17300832
2003	53.05732566
2004	66.76683289
2005	75.01566775
2006	81.81968751
2007	105.0333258
2008	135.18864099
2009	135.36675618
2010	153.10616336
2011	164.42915702
2012	152.68493162
2013	160.5106786
2014	174.65619551
2015	146.42312649
2016	156.57783679
2017	170.09098054
2018	198.18522041
2019	207.46070217
2020	235.73150978
2021	277.47116751