Year % of commercial profits 2005 23.7 2006 23.7 2007 23.7 2008 23.5 2009 23.5 2010 25 2011 23.1 2012 21.5 2013 21.5 2014 18.3 2015 18 2016 17.6 2017 17.5 2018 17.3 2019 17.3