Year	current US$
2000	9.67088093
2001	10.57286384
2002	11.49672997
2003	15.60677419
2004	18.61014458
2005	22.55364795
2006	34.0555058
2007	51.94370489
2008	56.39719863
2009	45.89583799
2010	49.2888344
2011	57.8469557
2012	55.00245687
2013	80.29850853
2014	66.16903756
2015	82.31520492
2016	70.57917058
2017	54.49251139
2018	24.98277007
2019	25.12675044
2020	13.75604662
2021	13.49664649