Year % of commercial profits 2005 19.593181818181815 2006 18.404444444444444 2007 17.86 2008 17.746666666666666 2009 17.842222222222222 2010 17.415555555555557 2011 17.86888888888889 2012 17.98260869565217 2013 18.07446808510639 2014 17.28510638297873 2015 17.597872340425532 2016 18.419148936170213 2017 18.4468085106383 2018 18.387234042553196 2019 18.47021276595745