Year	current US$
2000	11.4239452
2001	12.27529445
2002	12.89073988
2003	29.65391429
2004	29.96025176
2005	37.20777417
2006	48.24729246
2007	51.30002343
2008	60.92472619
2009	52.95230338
2010	60.57593914
2011	64.57943062
2012	68.64041978
2013	73.85205916
2014	78.95574746
2015	70.9015859
2016	59.97725671
2017	56.90349852
2018	50.41536379
2019	50.53100876
2020	52.63506453
2021	66.11944607