Year	current US$
2000	693.67926025
2001	673.92993164
2002	432.80075073
2003	380.19338989
2004	372.46127319
2005	441.00134277
2006	495.71600342
2007	572.52435303
2008	803.44226074
2009	817.64227295
2010	1032.65795898
2011	1232.04626465
2012	1332.7512207
2013	1500.72717285
2014	1480.01989746
2015	1410.3215332
2016	1454.54711914
2017	1655.83239746
2018	1697.01452637
2019	1677.09790039
2020	1427.14025879
2021	1620.32641602