Year	current US$
2000	287.91134664
2001	192.16910049
2002	233.10548572
2003	308.96389771
2004	275.48181931
2005	294.3783755
2006	329.77277675
2007	368.73861145
2008	476.95771747
2009	459.31326079
2010	533.66877828
2011	620.0058833
2012	717.23405809
2013	862.96142919
2014	985.5672293
2015	1072.90054446
2016	1160.35334489
2017	1254.59387809
2018	1320.95333806
2019	1461.32497291
2020	2017.88225488
2021	2500.81529145