Year constant 2010 US$ 2010 3039.22384995331 2011 3179.55873373059 2012 3326.19735972982 2013 3458.78194568448 2014 3572.60708763209 2015 3701.8250994663 2016 3845.92474223075 2017 3990.45470082681 2018 4154.77977073164