Year constant 2021 international $ 2010 23161.251352947984 2011 12087.02044515755 2012 23263.67503101324 2013 19021.266444432906 2014 14581.442196387445 2015 14404.626058465792 2016 13857.95289546292 2017 18094.11430492742 2018 19146.263064448452 2019 17866.135122919335 2020 7326.378110115737 2021 17927.947091015947 2022 18269.387408918705