Year	current US$
2000	160.81550599
2001	167.28891484
2002	184.69683513
2003	190.743405
2004	191.53770088
2005	197.95495404
2006	237.85616125
2007	280.49475701
2008	346.55213933
2009	375.71871388
2010	473.06547052
2011	520.93232761
2012	548.78770843
2013	579.98681514
2014	584.44308874
2015	636.43345247
2016	638.45928375
2017	627.58573502
2018	653.15354116
2019	663.61974384
2020	684.37428061
2021	664.38752383