Year	% of internal resources
1987	0.038461538461538464
1988	0.04065088769230769
1989	0.04284023653846154
1990	0.045029585769230766
1991	0.047218935
1992	0.049408283846153846
1993	0.05159763307692308
1994	0.053786982307692306
1995	0.055976331538461536
1996	0.058165680384615386
1997	0.06035502961538462
1998	0.06254437884615384
1999	0.0647337276923077
2000	0.06692307692307692
2001	0.06876923076923076
2002	0.07061538461538462
2003	0.07246153846153845
2004	0.07430769230769231
2005	0.07615384615384616
2006	0.07615384615384616
2007	0.07615384615384616
2008	0.07615384615384616
2009	0.07615384615384616
2010	0.07615384615384616
2011	0.07615384615384616
2012	0.07615384615384616
2013	0.07615384615384616
2014	0.07615384615384616
2015	0.07615384615384616
2016	0.07615384615384616
2017	0.07615384615384616
2018	0.07615384615384616
2019	0.07615384615384616
2020	0.07615384615384616