Year	current US$
2000	151.61459458
2001	161.2873253
2002	172.24630398
2003	181.09301749
2004	186.10647587
2005	281.74200484
2006	331.63764274
2007	513.89160051
2008	554.99691565
2009	620.78619007
2010	552.80704553
2011	619.34290121
2012	521.45649815
2013	622.7105347
2014	779.90809703
2015	890.13392605
2016	881.96013237
2017	874.45636434
2018	863.54352675
2019	901.83828332
2020	1079.6912258