Year	current US$
2004	241.17110443985652
2005	309.92683292848255
2006	436.8344264546377
2007	610.909947662228
2008	838.8135475291247
2009	743.9752465701613
2010	770.8971708319974
2011	887.7562936559809
2012	1041.751042369474
2013	1132.0129567218646
2014	1183.3769544162783
2015	1044.262519408457
2016	856.2215845583805
2017	913.4044312423582
2018	897.033456864227
2019	909.4644333745689
2020	869.1688292570243
2021	928.7859714964609