Year	current US$
2010	98.24945831
2011	87.49465179
2012	89.26095581
2013	100.13693237
2014	114.44429779
2015	105.09803009
2016	106.18969727
2017	92.25428772
2018	114.63294983
2019	54.80850601
2020	50.67650986
2021	62.73724365