Year	current US$
2000	186.37219636
2001	191.22905127
2002	200.5457785
2003	211.88465819
2004	235.21509097
2005	260.06949612
2006	306.68490318
2007	305.40082905
2008	296.5653362
2009	323.15071579
2010	322.01239178
2011	335.55322816
2012	339.74664725
2013	351.79816941
2014	387.75535669
2015	388.37232049
2016	459.39887721
2017	485.41594401
2018	506.99043292
2019	593.20399803
2020	565.39739619
2021	640.59895035