Year	constant 2015 US$
2004	535.1404697223516
2005	511.4508125908281
2006	511.4513892938981
2007	522.2605005397942
2008	510.2237049414395
2009	523.9223217673004
2010	523.3134465422715
2011	458.98802271158274
2012	456.966515274297
2013	456.02889952221835
2014	434.5378126164374
2015	451.95140489161975
2016	453.8623347859444
2017	454.72927871070857
2018	514.4915749167877
2019	517.4058227665234
2020	497.0918708707807
2021	526.3437082243237