Year	current US$
2000	129.32587746
2001	110.38630059
2002	104.12898358
2003	107.27451141
2004	125.61439056
2005	159.67783843
2006	207.73388677
2007	255.18587432
2008	308.45049206
2009	317.72222828
2010	402.38873914
2011	457.48902574
2012	413.54290868
2013	435.31874961
2014	446.50474732
2015	338.49178101
2016	342.75336886
2017	391.23177087
2018	354.73819906
2019	346.47301073
2020	313.57747693
2021	346.70005759