Year	current US$
2000	200.05258179
2001	185.71792603
2002	173.69114685
2003	257.41162109
2004	347.8963623
2005	375.39160156
2006	410.32162476
2007	465.08157349
2008	413.3742981
2009	386.20196533
2010	522.15911865
2011	569.14294434
2012	557.58959961
2013	495.19512939
2014	466.1987915
2015	495.62979126
2016	430.21606445
2017	475.58203125
2018	472.99014282
2019	432.14578247
2020	378.42468262
2021	456.43600464