Year	current US$
2000	103.52375478
2001	102.14648199
2002	98.59990928
2003	102.46997077
2004	111.77505962
2005	126.49308816
2006	145.00067982
2007	166.10058227
2008	204.90800746
2009	226.29942138
2010	249.38634026
2011	272.12414072
2012	304.4277563
2013	322.02443066
2014	352.40885836
2015	377.78903076
2016	378.26300574
2017	355.05560307
2018	383.48453643
2019	335.45880846
2020	294.31870795
2021	331.89435057