Year	current US$
2000	0.5224013178576881
2001	0.6112405251367385
2002	0.661585641231008
2003	1.0203141162323897
2004	2.0729752501220893
2005	2.000171545232354
2006	1.6521725931553686
2007	2.316879790271889
2008	2.6190708557799
2009	2.2927218589140916
2010	2.5838320196328612
2011	2.8301592077618594
2012	2.707972420515211
2013	2.757680930720801
2014	2.6045191964795613
2015	2.144531851502029
2016	2.094376579035078
2017	2.1601244881976487
2018	2.0142289237885813
2019	2.0429139697579264
2020	1.9312698882746895
2021	4.2176641353510105