Year	current US$
2000	167.32845905
2001	161.77257587
2002	170.43701644
2003	189.13728812
2004	177.75382283
2005	186.65654688
2006	229.05937844
2007	281.45221601
2008	256.72532611
2009	248.37954648
2010	239.95132659
2011	253.8063382
2012	232.23158186
2013	248.45936576
2014	240.46264122
2015	226.56690204
2016	217.03296829
2017	231.79182987
2018	223.25315284
2019	210.57055215
2020	204.82429317
2021	217.61743814