Year	% of internal resources
2002	4.816282806641671
2003	4.859846455811462
2004	4.903410105516872
2005	4.946973754686663
2006	4.978575254418853
2007	5.010176754151044
2008	5.570433851098018
2009	5.049276914836636
2010	4.9571505088377075
2011	4.554365291912158
2012	4.970540974825924
2013	6.189608998393143
2014	5.25066952329941
2015	4.80449919657204
2016	4.752544188537761
2017	4.988752008569898
2018	5.14729512587038
2019	5.056239957150508
2020	5.372254954472415