Year	current US$
2000	427.0623551
2001	385.86350735
2002	394.79277453
2003	443.0629712
2004	513.1019704
2005	538.2527323
2006	554.71306522
2007	606.71109025
2008	699.41247906
2009	659.86771612
2010	723.35955909
2011	787.21317206
2012	790.31015067
2013	755.82205393
2014	727.97032294
2015	695.96794276
2016	648.01247985
2017	605.29091604
2018	717.1890248
2019	636.92087387
2020	612.02775549
2021	646.62156944