Year	% of internal resources
1987	0.9226965122332118
1988	1.092313031363873
1989	1.2619295506246746
1990	1.4315460697553357
1991	1.4744924518479958
1992	1.5174388339406557
1993	1.560385216033316
1994	1.6033315981259761
1995	1.6416796807652265
1996	1.6800277632743361
1997	1.7183758459135865
1998	1.756723928552837
1999	1.795072011061947
2000	1.8334200937011973
2001	1.869963560645497
2002	1.906507027589797
2003	1.9430504945340967
2004	1.9795939614783966
2005	2.0161374284226965
2006	1.9601480710567412
2007	1.9027994678552835
2008	1.8461304876366478
2009	1.7904809416970326
2010	1.7348313956272774
2011	1.6791818496876623
2012	1.6242119266007289
2013	1.5682225692347735
2014	1.5122332118688182
2015	1.5122332118688182
2016	1.5122332118688182
2017	1.5122332118688182
2018	1.5122332118688182
2019	1.5122332118688182
2020	1.5122332118688182