Year	current US$
2000	70.3615111
2001	73.01366615
2002	74.51304663
2003	78.03844345
2004	82.58254737
2005	98.60589976
2006	89.32184828
2007	99.36595887
2008	105.78827676
2009	98.15127419
2010	101.57941936
2011	111.90699159
2012	116.6303491
2013	120.3506002
2014	114.42963331
2015	116.03058243
2016	116.48886883
2017	125.16699299
2018	129.76972601
2019	142.02957861
2020	97.20486406
2021	118.24239812