Year	current US$
2000	0.15955206
2001	0.16355302
2002	0.18920972
2003	0.23488629
2004	0.26352913
2005	0.28339044
2006	0.31404879
2007	0.34258609
2008	0.33607573
2009	0.28711755
2010	0.30963019
2011	0.35793666
2012	0.3833121
2013	0.4243679
2014	0.45307035
2015	0.46988245
2016	0.45750447
2017	0.49178208
2018	0.50576025
2019	0.49959424
2020	0.49565177
2021	0.59330736