Year	current US$
2000	51.02456979
2001	51.01123765
2002	59.40939152
2003	71.45202249
2004	80.18358863
2005	95.21479902
2006	107.45744628
2007	127.82334132
2008	193.3341644
2009	175.97316049
2010	186.77176452
2011	204.7350727
2012	199.8619206
2013	234.04794872
2014	273.17886645
2015	255.50481285
2016	259.83330094
2017	286.00505629
2018	309.08000602
2019	306.40476671
2020	239.41550538
2021	242.35993247