Year	current US$
2000	168.05632853
2001	196.07187278
2002	210.92938588
2003	230.46978203
2004	240.57563113
2005	265.12718694
2006	277.45632728
2007	294.24354554
2008	280.25979196
2009	235.26063066
2010	234.62776845
2011	232.48255744
2012	238.90177756
2013	251.72202457
2014	251.40510201
2015	229.09200705
2016	203.91293051
2017	215.16397985
2018	224.51390341
2019	233.69545929
2020	208.73659694
2021	252.62833986