Year	current US$
2000	58.08052062666874
2001	66.44809955387723
2002	77.0051329615081
2003	95.36113647604944
2004	122.15783960703098
2005	139.21851347839632
2006	155.8481871419271
2007	196.09858352166654
2008	243.99397229078872
2009	221.01065805310182
2010	226.72870094229606
2011	247.46321171258697
2012	239.97036188900358
2013	244.32386744970648
2014	248.04406972939358
2015	220.1224610023869
2016	231.84514572569782
2017	254.0178466279014
2018	269.60674319104277
2019	277.7120408207527
2020	283.1816789285426
2021	334.20369444347966