Year % gross 2010 102.544998168945 2011 102.334999084473 2012 102.84700012207 2013 102.509002685547 2014 101.732002258301 2015 101.327003479004 2016 100.692863464355 2017 100.571716308594 2018 100.224937438965 2019 100.684967041016 2020 100.512939453125 2021 99.687141418457