Year % of internal resources 2007 14.3 2008 14.3 2009 14.3 2010 14.3 2011 14.3 2012 14.3 2013 14.3 2014 14.3 2015 14.3 2016 14.3 2017 14.3 2018 14.3 2019 14.3 2020 14.3