Year	current US$
2000	1.92521964
2001	1.61254988
2002	1.7377795
2003	0.96540545
2004	1.48532897
2005	1.57622447
2006	1.51460128
2007	2.71734492
2008	4.07062892
2009	5.41482899
2010	6.22672122
2011	8.49720328
2012	9.57653568
2013	2.35468974
2014	5.63099246
2015	8.07273715
2016	9.63882964
2017	9.6062109
2018	11.26357128
2019	8.37936218
2020	5.54929118
2021	7.33595352