Year	constant 2015 US$
2000	8375.791087893314
2001	8598.495207569107
2002	8862.901785654196
2003	9152.504021565399
2004	9424.199070395945
2005	9890.210149550538
2006	10379.934622710134
2007	10884.476387150353
2008	11176.772162101459
2009	10511.378040026211
2010	10696.652492942087
2011	10962.61545311708
2012	11246.184697629007
2013	11224.752604551752
2014	11224.006097644551
2015	11474.990918675925
2016	11549.80192757659
2017	11936.441588646705
2018	12212.646697798427
2019	12606.133438309318
2020	11864.5478064321
2021	12457.782479807109