Year	current US$
2000	10.941871608353717
2001	10.767592231903258
2002	11.556522921163387
2003	16.764941514273573
2004	18.038820748412466
2005	20.38547247620105
2006	24.32652813489155
2007	27.791687592052693
2008	31.708290642866604
2009	28.733564699919384
2010	30.852514941081083
2011	32.62991325293495
2012	36.73348132264392
2013	40.403359845138745
2014	41.73870618576437
2015	39.30442137132619
2016	35.00329942963711
2017	34.42960575559472
2018	31.92577048847197
2019	32.182395775189725
2020	33.01875470831398
2021	35.87590119520263