Year constant 2010 US$ 2010 1459.54669165577 2011 1659.75648967423 2012 1839.46980578539 2013 2081.30792467171 2014 2168.4984400021 2015 2299.40597116926 2016 2196.65876497765 2017 2150.60798342152 2018 2194.40969681644