Year	current US$
2000	35.20012415
2001	50.90769336
2002	65.08304125
2003	44.51533266
2004	34.86958123
2005	8.14182131
2006	20.05219439
2007	151.66078721
2008	323.9439113
2009	235.44638768
2010	207.31252095
2011	237.4175926
2012	416.6512487
2013	308.06066187
2014	122.32728448
2015	339.08263027
2016	54.24441086
2017	252.33306003
2018	105.08596061
2019	84.6327981
2020	254.57329472
2021	160.018321