Year	current US$
2000	153.82098719
2001	152.16906805
2002	157.2114103
2003	154.29260417
2004	138.65659682
2005	157.67535053
2006	169.97242945
2007	196.92968302
2008	218.32362475
2009	201.96579584
2010	207.28271293
2011	213.43123677
2012	220.06782201
2013	223.47327395
2014	191.38284814
2015	210.18901401
2016	218.94930153
2017	238.89379107
2018	241.01250467
2019	265.35817883
2020	253.54815408
2021	271.27701971