Year	current US$
2000	7.36981916
2001	7.52252769
2002	8.51982498
2003	11.43507481
2004	17.09873199
2005	17.50115776
2006	20.64653969
2007	27.04532623
2008	28.90426254
2009	30.68659401
2010	32.8663559
2011	33.8243866
2012	33.78236771
2013	42.40937042
2014	38.37065506
2015	32.44025803
2016	39.64500427
2017	43.07155609
2018	39.00283813
2019	41.07073212
2020	54.17696762
2021	56.95098114