Year	current US$
2000	65.2235306
2001	69.46757616
2002	73.28533749
2003	74.97139854
2004	75.10423066
2005	74.39983502
2006	73.31708771
2007	75.64475354
2008	77.38484828
2009	73.31858453
2010	74.35776793
2011	75.20039201
2012	77.37713536
2013	82.76258176
2014	84.4330759
2015	84.15580708
2016	83.74236339
2017	82.55288073
2018	83.7438554
2019	85.82020307
2020	74.12883786
2021	87.83913783