Year	current US$
2000	10.70797699
2001	10.67344931
2002	10.16337202
2003	15.69318774
2004	48.48688743
2005	77.78336037
2006	98.39365967
2007	91.53160842
2008	89.48839683
2009	75.20236014
2010	74.43836168
2011	62.02803708
2012	44.23504397
2013	31.88826041
2014	28.08649957
2015	28.30636287
2016	29.98961469
2017	32.21965143
2018	22.08553543
2019	20.26714706
2020	19.35755992
2021	37.13268387