Year	current US$
2000	343.62418412
2001	318.81340552
2002	351.32839509
2003	429.04887176
2004	530.59564721
2005	592.06104042
2006	630.8025131
2007	725.01159977
2008	782.0420384
2009	764.38723228
2010	982.62001538
2011	1132.93073858
2012	1210.34346002
2013	1140.99216048
2014	1094.22189384
2015	915.65117519
2016	924.25290048
2017	965.31080593
2018	951.47379605
2019	817.13262418
2020	888.60941181
2021	975.40266361