Year constant 2021 international $ 2008 3081.4075800745363 2009 3167.362078383745 2010 3301.2811606661594 2011 3070.583492836867 2012 3282.1635149908666 2013 3512.7077532803955 2014 5137.627763618656 2015 5347.009298469821 2016 5582.247992883383 2017 5804.946039940759 2018 5941.990576573721 2019 6182.837505242548 2020 6057.456504938428 2021 6320.312516072258 2022 6540.49216442057 2023 6735.416264833226