Year % of commercial profits 2005 36.7 2006 32.8 2007 31.4 2008 31.4 2009 26.2 2010 26.2 2011 26.2 2012 26.2 2013 26.2 2014 26 2015 25.9 2016 25.9 2017 25.9 2018 25.6 2019 25.5