Year	current US$
2000	592.58049166
2001	606.69639617
2002	666.02375023
2003	917.93437318
2004	1073.14053948
2005	1115.10323479
2006	1178.34693727
2007	1392.56972081
2008	1615.12423689
2009	1521.21850448
2010	1487.02614184
2011	1564.79234476
2012	1471.8021696
2013	1597.48587192
2014	1649.50444102
2015	1404.93661681
2016	960.52927113
2017	944.85900737
2018	1033.3648895
2019	1068.76927775
2020	936.13251885
2021	883.87109965