Year	current US$
2000	56.13910675
2001	53.05221176
2002	57.02854919
2003	78.68141174
2004	79.00400543
2005	89.38618469
2006	66.81880188
2007	69.87314606
2008	77.46207428
2009	76.35579681
2010	74.38393402
2011	84.74559784
2012	86.12266541
2013	124.09713745
2014	118.93055725
2015	84.50744629
2016	109.2252121
2017	116.49388123
2018	108.28024292
2019	106.26776123
2020	158.96191406
2021	186.10397339