Year	current US$
2000	223.58602996
2001	220.96464123
2002	247.36333493
2003	277.19449335
2004	313.68701169
2005	338.17280074
2006	332.55195504
2007	322.27863478
2008	323.30123986
2009	378.40793144
2010	379.01908669
2011	393.62378557
2012	357.49493511
2013	320.87034923
2014	299.11492691
2015	295.26308897
2016	294.56287403
2017	296.95455412
2018	300.93895358
2019	301.97482958
2020	266.17242658
2021	289.60112189