Year	current US$
2000	471.15670196
2001	463.73992171
2002	547.79621197
2003	728.57743416
2004	828.2850741
2005	858.23813426
2006	901.16233271
2007	1049.40562
2008	1128.51320304
2009	1099.28934884
2010	1076.24568875
2011	1174.27482785
2012	1107.44897465
2013	1189.87065853
2014	1213.04553412
2015	1049.15214811
2016	1055.09609932
2017	1112.9599652
2018	1211.3964386
2019	1250.83206798
2020	1127.7805387
2021	1272.61777273