Year	current US$
2000	3360.678060681196
2001	3713.5167609267605
2002	4381.989692251539
2003	5854.697322983768
2004	7216.364041490499
2005	8538.238628975956
2006	10243.972630128377
2007	13193.38031742295
2008	14305.919160052428
2009	11532.879939404278
2010	11282.422335869393
2011	13704.931508402044
2012	13778.337233375392
2013	15315.388435920795
2014	16276.91132775911
2015	14040.886020332035
2016	14872.602416664362
2017	16600.900748468935
2018	18854.373307904145
2019	19062.769488820693
2020	19133.100649843327
2021	22462.364753587786