Year including construction (constant 2010 US$) 2010 76228.3317271862 2011 69892.9179959898 2012 68358.3781487162 2013 60838.9196342631 2014 55417.4185579925 2015 53299.2226248013 2016 50445.8176069917 2017 45631.8960522384 2018 46869.6305761725