Year constant 2010 US$ 2007 572.42461615317 2008 588.470217414539 2009 601.239282797822 2010 617.783266102884 2011 637.377903432254 2012 654.603186905564 2013 668.883080088347 2014 693.752927267216 2015 707.96332758936 2016 721.868856924463