Year	current US$
2000	17.18489456
2001	18.7846756
2002	22.93144798
2003	21.89597321
2004	22.70127487
2005	26.26749039
2006	29.28122711
2007	30.97717667
2008	36.24853897
2009	37.96392822
2010	36.55500031
2011	47.91463089
2012	50.08378601
2013	81.8790741
2014	138.29064941
2015	114.16482544
2016	81.37689209
2017	45.5368042
2018	43.07834244
2019	46.25284195
2020	46.01692963
2021	43.1619873