Year	current US$
2008	1950
2009	2030
2010	2130
2011	2180
2012	2450
2013	2700
2014	2970
2015	2860
2016	2460
2017	2090
2018	2020
2019	2110
2020	2110
2021	2160
2022	2160
2023	1930