Year	current US$
2000	54.16062546
2001	54.03316116
2002	57.24786377
2003	64.14105988
2004	67.6804657
2005	62.34985352
2006	60.48682404
2007	64.6838913
2008	75.87518311
2009	72.83110809
2010	71.98825836
2011	72.44979095
2012	74.48454285
2013	71.52493286
2014	79.31149292
2015	62.51667023
2016	66.39353943
2017	68.61872864
2018	70.97071075
2019	73.64801788
2020	85.17427826
2021	81.86914825