Year	% of internal resources
1987	0.791304347826087
1988	0.8439241921739129
1989	0.8965440356521739
1990	0.9491638800000001
1991	1.001783723478261
1992	1.054403567826087
1993	1.1070234113043478
1994	1.1596432556521739
1995	1.2122630991304346
1996	1.2648829434782607
1997	1.3175027869565217
1998	1.370122631304348
1999	1.4227424747826087
2000	1.4753623191304348
2001	1.472463767826087
2002	1.4695652173913043
2003	1.626086956521739
2004	1.7826086956521738
2005	1.9391304347826088
2006	1.9391304347826088
2007	1.9391304347826088
2008	1.9391304347826088
2009	1.9391304347826088
2010	1.9391304347826088
2011	1.9391304347826088
2012	1.9391304347826088
2013	1.9391304347826088
2014	1.9391304347826088
2015	1.9391304347826088
2016	1.9391304347826088
2017	1.9391304347826088
2018	1.9391304347826088
2019	1.9391304347826088
2020	1.9391304347826088