Year % of commercial profits 2006 5.4 2007 5.4 2008 5.4 2009 5.4 2010 5.4 2011 5.4 2012 5.4 2013 5.4 2014 5.4 2015 5.4 2016 5.4 2017 5.4 2018 5.4 2019 6.1