Year	current US$
2000	75.54572077
2001	79.79011213
2002	80.95992843
2003	84.49240103
2004	89.72610302
2005	116.03377483
2006	103.88256345
2007	115.371203
2008	122.37593593
2009	117.03968143
2010	120.52668281
2011	132.47580301
2012	138.15182153
2013	142.77012274
2014	135.67841578
2015	143.22662106
2016	144.25743758
2017	152.68567449
2018	156.06621602
2019	175.20583898
2020	123.95282271
2021	149.63733621