Year	current US$
2005	6.002743020973716
2006	7.78350793158077
2007	8.935301774328961
2008	11.664585889844284
2009	10.333962176005311
2010	14.367603415625913
2011	12.661649044648799
2012	10.889360495575662
2013	11.345716980129746
2014	12.764968951242816
2015	11.053711209069137
2016	-2.356015052934559
2017	-26.447858028901926
2018	12.625565490573734
2019	22.49633203550548
2020	34.740048280797495
2021	15.01840689591839
2022	1.7674332442763392