Year	current US$
2000	43.4030736
2001	56.01621844
2002	44.0967707
2003	40.03864831
2004	41.20514636
2005	63.26694595
2006	57.32831035
2007	60.9926144
2008	42.75981865
2009	43.29109113
2010	46.21271359
2011	54.43551372
2012	61.52709963
2013	61.24062685
2014	66.09863704
2015	65.52080636
2016	69.26824759
2017	70.69075673
2018	72.6056056
2019	78.17913616
2020	80.53777899
2021	74.24197212