Year	% of internal resources
1994	18.153167349511502
1995	18.36038449416956
1996	18.567601638827608
1997	18.77481878348566
1998	18.982035928143713
1999	19.189253072801765
2000	19.396470217459814
2001	19.10384494169556
2002	18.811219665931294
2003	18.51859439016703
2004	18.225969114402773
2005	17.93334383863851
2006	17.64071856287425
2007	17.505025037661518
2008	17.369331512448788
2009	17.233637987236055
2010	17.09794446202332
2011	16.96225093665301
2012	16.826557411440277
2013	16.690863886227543
2014	16.555170361014813
2015	16.41947683580208
2016	13.786637251812166
2017	12.587456665616138
2018	15.401827923101163
2019	16.706586826347305
2020	16.706586826347305