Year	% of internal resources
2006	16.46972860125261
2007	17.013778705636742
2008	17.221085594989564
2009	17.026304801670143
2010	17.384759916492694
2011	17.54885177453027
2012	17.588308977035492
2013	17.629853862212943
2014	17.626722338204594
2015	18.03757828810021
2016	18.18580375782881
2017	19.163106471816285
2018	19.239626469728602
2019	17.92633549895616
2020	17.92633549895616