Year	current US$
2000	48.67858491
2001	50.30595311
2002	51.82295263
2003	27.83193351
2004	28.3295796
2005	54.38362932
2006	57.19080345
2007	78.78220686
2008	107.17269866
2009	116.55801097
2010	138.64195907
2011	159.68053074
2012	167.19003087
2013	171.44909278
2014	160.78634089
2015	161.94431397
2016	191.61799121
2017	201.52726845
2018	200.6990248
2019	211.86982308
2020	232.47894565
2021	278.62370128