Year	current US$
2000	55.205270759628505
2001	56.572109583531
2002	55.57184080442894
2003	53.75382126243013
2004	60.36789583513194
2005	67.95967726895195
2006	71.67476929051811
2007	85.5130035779395
2008	102.13369701944355
2009	109.45112516549638
2010	124.53495951276282
2011	136.04794091959695
2012	142.18585776554178
2013	135.18266820783137
2014	128.71420919726438
2015	130.9357185607015
2016	134.6734974172031
2017	132.33941153673294
2018	137.07574610920682
2019	130.81830999047446
2020	124.94300272702846
2021	132.30551497877357