Year	current US$
2000	98.60929553840927
2001	97.40849772101717
2002	94.69479282637123
2003	105.941962407022
2004	122.81284187797985
2005	145.3208839727349
2006	167.67284892484201
2007	201.4119965227957
2008	242.01287373949728
2009	256.90145294896826
2010	300.5432083842168
2011	354.1445887348111
2012	378.47488691577576
2013	405.2990360612377
2014	420.66481981800524
2015	410.97514288077
2016	409.095819372479
2017	451.228655581616
2018	478.1554061313464
2019	491.12840744483236
2020	499.4336879261744
2021	567.8520659647227