Year	current US$
2000	13.00008678
2001	28.92523384
2002	29.05480003
2003	34.8696785
2004	49.77629852
2005	54.21235657
2006	69.76922607
2007	92.84111786
2008	135.63153076
2009	120.0315094
2010	96.66415405
2011	121.91368866
2012	121.79575348
2013	142.88616943
2014	130.74234009
2015	107.64356232
2016	94.1061554
2017	112.85147095
2018	83.89920044
2019	64.65779114
2020	55.05102158
2021	64.16342163