Year	current US$
2000	0.5736994813939997
2001	0.573611512283985
2002	0.659156637747
2003	0.8953950054022803
2004	1.5809399616045519
2005	1.6310509471937986
2006	1.7090274642395318
2007	2.153790429172129
2008	2.396293112419234
2009	2.392858698951202
2010	2.663009778776362
2011	3.0637201170022648
2012	2.97479740294617
2013	3.2651767676077603
2014	3.2119522728735794
2015	2.6777009967650796
2016	2.571398991807318
2017	2.5738593120571784
2018	2.5691846451379483
2019	2.8007917969258194
2020	2.657483535147597
2021	4.259159215487836