Year constant 2015 US$ 2012 6040117889.1838 2013 6298388687.914398 2014 6665127485.515174 2015 6629252381.425264 2016 7095965431.354513 2017 7298531925.4848175 2018 7440371339.596696 2019 7500776000.386848 2020 6680179249.668426 2021 6927645033.02465