Year	current US$
2000	237.82832336
2001	204.25814819
2002	180.86155701
2003	288.37631226
2004	365.53488159
2005	404.39968872
2006	422.18884277
2007	460.02288818
2008	446.90435791
2009	492.94265747
2010	628.12860107
2011	694.10058594
2012	654.25469971
2013	602.6763916
2014	547.83441162
2015	499.36334229
2016	463.34463501
2017	536.77722168
2018	570.09777832
2019	551.4352417
2020	492.20724487
2021	583.67108154