Year	current US$
2000	50.73020259
2001	47.23408622
2002	59.80102214
2003	89.07440571
2004	122.62283716
2005	141.91559825
2006	157.00155935
2007	213.90842238
2008	259.06248176
2009	234.53140334
2010	240.23675604
2011	260.1524554
2012	259.09030543
2013	303.91294011
2014	325.20056289
2015	293.36325691
2016	311.55500427
2017	357.52966481
2018	409.89924357
2019	409.59566706
2020	410.74182036
2021	498.93876188