Year	current US$
2000	14.10407162
2001	14.47130299
2002	12.91643047
2003	17.61871719
2004	16.27066612
2005	17.37983894
2006	19.28023911
2007	24.81284904
2008	26.80659485
2009	35.78236008
2010	34.58347702
2011	27.16216469
2012	32.51623917
2013	43.56784058
2014	45.61304092
2015	52.15144348
2016	54.51382828
2017	61.60005188
2018	57.35622025
2019	67.81835938
2020	52.15844727
2021	68.87698364