Year	current US$
2000	44.25434525
2001	46.77354951
2002	49.79773673
2003	49.49460076
2004	54.60812666
2005	67.66553032
2006	68.2846137
2007	76.98155986
2008	91.78271516
2009	104.95168207
2010	124.69307897
2011	134.03515292
2012	161.31615708
2013	178.88226603
2014	197.56753528
2015	188.88823913
2016	192.02868633
2017	207.09637039
2018	223.49862066
2019	230.53665051
2020	267.39816259
2021	267.33566446