Year	current US$
2000	19.78130531
2001	22.66413116
2002	24.67282104
2003	25.30601883
2004	29.03012466
2005	32.52131653
2006	33.02656555
2007	30.92131042
2008	49.00638199
2009	55.72327423
2010	54.09758377
2011	66.05435944
2012	69.01600647
2013	72.11994934
2014	73.5883255
2015	72.51950836
2016	78.35865784
2017	79.16844177
2018	93.01556396
2019	114.48534393
2020	112.21422577
2021	122.41645813