Year	current US$
2000	61.18118080345097
2001	65.36115691944124
2002	63.88047352828063
2003	62.202626192704464
2004	67.87434469442131
2005	76.594740575434
2006	89.61780741765988
2007	103.93481811408978
2008	122.36496677105592
2009	136.49473742328038
2010	138.74990902500474
2011	163.83485078731513
2012	173.34120914331262
2013	195.9448579663909
2014	216.39297753728297
2015	197.50771622609983
2016	223.6542706659339
2017	212.37183637564692
2018	220.60526978577903
2019	226.33780396753414
2020	242.07781101630007
2021	255.32438425372294