Year	current US$
2000	51.75124176
2001	53.72456696
2002	59.29033932
2003	71.39179448
2004	80.64562553
2005	82.35396238
2006	83.69706969
2007	91.97229842
2008	102.22405156
2009	100.40205361
2010	102.41145876
2011	112.72380539
2012	114.34213775
2013	114.51689169
2014	118.60978045
2015	113.63446807
2016	106.36347697
2017	101.22797356
2018	100.71919247
2019	85.40499993
2020	94.76449396
2021	103.04665417