Year	current US$
2000	354.08279419
2001	384.13986206
2002	368.28140259
2003	429.45440674
2004	485.71817017
2005	499.62393188
2006	513.20196533
2007	450.61437988
2008	390.29763794
2009	329.66345215
2010	472.47903442
2011	484.18115234
2012	599.81970215
2013	583.38354492
2014	650.09362793
2015	623.9987793
2016	735.57043457
2017	736.65460205
2018	784.73242188
2019	769.74798584
2020	781.51965332
2021	718.49005127