Year	% of internal resources
1987	0.9560229445506693
1988	0.9439378336520076
1989	0.931852722753346
1990	0.9197676137667303
1991	0.9076825028680688
1992	0.8955973919694071
1993	0.8835122810707456
1994	0.871427170172084
1995	0.8593420592734226
1996	0.8472569502868068
1997	0.8351718393881453
1998	0.8230867284894836
1999	0.8110016175908221
2000	0.8374760994263861
2001	0.8374760994263861
2002	0.8374760994263861
2003	0.8374760994263861
2004	0.8374760994263861
2005	0.8374760994263861
2006	0.8374760994263861
2007	0.8374760994263861
2008	0.8374760994263861
2009	0.8374760994263861
2010	0.8374760994263861
2011	0.8374760994263861
2012	0.8374760994263861
2013	0.8374760994263861
2014	0.8374760994263861
2015	0.8374760994263861
2016	0.8374760994263861
2017	0.8374760994263861
2018	0.8374760994263861
2019	0.8374760994263861
2020	0.8374760994263861