Year	current US$
2000	5.21749769
2001	5.79685891
2002	6.45459088
2003	6.51793296
2004	8.32772901
2005	12.00181524
2006	12.67441472
2007	15.42031068
2008	20.84363945
2009	17.44744875
2010	27.90925146
2011	43.5407466
2012	53.51574659
2013	67.09161468
2014	61.48654455
2015	60.32805342
2016	58.9457252
2017	61.32177487
2018	83.10200087
2019	85.29261598
2020	81.91591845
2021	105.82789937