Year	% of internal resources
1987	0.40856672158154855
1988	0.4281488692586491
1989	0.44773101693574957
1990	0.46731316457990113
1991	0.4868953122570016
1992	0.5064774599341021
1993	0.5260596076112025
1994	0.5456417552883032
1995	0.5652239029654037
1996	0.5848060506095553
1997	0.6043881982866557
1998	0.6239703459637561
1999	0.6435524936408566
2000	0.648518130247117
2001	0.6534837668204283
2002	0.6584494034266887
2003	0.6634150400329489
2004	0.6683806766062603
2005	0.6733463132125206
2006	0.678311949818781
2007	0.6832775863920924
2008	0.6879736408566722
2009	0.6879736408566722
2010	0.6879736408566722
2011	0.6879736408566722
2012	0.6879736408566722
2013	0.6879736408566722
2014	0.6879736408566722
2015	0.6879736408566722
2016	0.6879736408566722
2017	0.6879736408566722
2018	0.6879736408566722
2019	0.6879736408566722
2020	0.6879736408566722