Year	current US$
2000	351.86185258
2001	393.22232591
2002	462.26829174
2003	618.18950132
2004	734.37372487
2005	832.22448176
2006	919.61268966
2007	1008.975906
2008	1166.01635935
2009	1261.71798788
2010	1222.90441046
2011	1549.13802599
2012	1463.29256607
2013	1551.63918104
2014	1531.05605776
2015	1290.72585636
2016	1301.20948243
2017	1353.8150579
2018	1400.68565554
2019	1406.71928415
2020	1339.52019337
2021	1528.91815248