Year	% of internal resources
1987	0.1310615989515072
1988	0.15130473525557012
1989	0.17154787090432505
1990	0.19179100720838793
1991	0.21203414351245084
1992	0.23227727916120577
1993	0.25252041546526866
1994	0.31588905832241154
1995	0.3792577018348624
1996	0.435778376146789
1997	0.4922990511140236
1998	0.5488197254259503
1999	0.6053404003931848
2000	0.6618610747051115
2001	0.6618610747051115
2002	0.6618610747051115
2003	0.6618610747051115
2004	0.6618610747051115
2005	0.6618610747051115
2006	0.6618610747051115
2007	0.6618610747051115
2008	0.6618610747051115
2009	0.6618610747051115
2010	0.6618610747051115
2011	0.6618610747051115
2012	0.6618610747051115
2013	0.6618610747051115
2014	0.6618610747051115
2015	0.6618610747051115
2016	0.6618610747051115
2017	0.6618610747051115
2018	0.6618610747051115
2019	0.6618610747051115
2020	0.6618610747051115