Year	current US$
2000	169.37162648739417
2001	156.36392458196914
2002	155.94630474915857
2003	173.8498178075185
2004	192.87520855802035
2005	201.75213084487237
2006	201.91404474825006
2007	219.2236674337436
2008	255.55285270248183
2009	291.051562388926
2010	332.5212988691021
2011	417.0654197940106
2012	442.83007134046306
2013	415.9720658839828
2014	425.43800234212637
2015	415.7480474529604
2016	436.73148877812764
2017	452.16552207668553
2018	483.9935197578268
2019	504.695477740225
2020	524.3237449329804
2021	571.7061360843315