Year constant 2015 US$ 2011 776.8393624728359 2012 822.2463067361009 2013 851.047510172114 2014 899.9966835266761 2015 935.1625593884605 2016 976.5435506099419 2017 1013.3363313858348 2018 1061.354153111143 2019 1111.8839427198482 2020 1105.2254262427268 2021 1122.7629496927016