Year % of profit 2005 78.35 2006 82.6952380952381 2007 80.65238095238094 2008 79.93809523809524 2009 79.67142857142858 2010 78.34285714285713 2011 61.07142857142857 2012 60.61428571428572 2013 57.540909090909096 2014 48.23181818181818 2015 48.93181818181818 2016 50.550000000000004 2017 50.472727272727276 2018 50.69545454545455 2019 52.050000000000004