Year	current US$
2000	17.44675827
2001	20.41893959
2002	17.09034348
2003	21.64731407
2004	27.67554474
2005	31.10122681
2006	36.16910553
2007	42.22277832
2008	63.7890892
2009	48.9272995
2010	54.86231995
2011	59.84463501
2012	71.6878891
2013	72.29035187
2014	71.47676086
2015	57.67850113
2016	54.67388153
2017	52.68054199
2018	47.67589569
2019	58.90272522
2020	80.80835724
2021	80.5149231