Year	current US$
2000	10.38308048
2001	12.00212383
2002	18.5837326
2003	18.59137535
2004	28.63477135
2005	32.28604889
2006	34.9785614
2007	35.18187714
2008	38.15471268
2009	36.02885056
2010	36.498703
2011	38.68487549
2012	37.49700546
2013	39.97917175
2014	43.6758728
2015	35.03440857
2016	33.10380936
2017	31.06099701
2018	32.30886459
2019	31.30481529
2020	35.72977829
2021	35.63117981