Year	current US$
2000	18.72773552
2001	27.99723434
2002	75.52088928
2003	87.19217682
2004	104.68054199
2005	122.74163055
2006	144.0280304
2007	179.56561279
2008	222.33100891
2009	255.58073425
2010	241.66999817
2011	266.68746948
2012	284.08352661
2013	289.67935181
2014	294.76089478
2015	229.11935425
2016	229.76306152
2017	231.0456543
2018	248.69200134
2019	231.83953857
2020	246.76673889
2021	255.56524658