Year % gross 2004 18.1338596343994 2005 18.1851596832275 2006 18.9753608703613 2007 19.7609996795654 2009 25.1326599121094 2010 25.1620998382568 2011 26.3746490478516 2012 26.9174995422363 2013 28.0433101654053 2014 28.2354602813721 2015 29.6435108184814 2016 32.7882881164551 2017 39.4879989624023 2018 39.9829711914062 2019 40.7695617675781 2020 39.9565887451172 2021 41.026969909668 2022 39.4047317504883