Year	% of internal resources
1976	9.452054794520548
1977	9.469706200445206
1978	9.487357606335616
1979	9.505009012260274
1980	9.522660418184932
1981	9.540311824075342
1982	9.55796323
1983	9.575614635890412
1984	9.593366979075341
1985	9.610917447739725
1986	9.628695025239727
1987	9.646220259554795
1988	9.663871665479453
1989	9.681687094452055
1990	9.699111391506849
1991	9.716825883184931
1992	9.734477289109588
1993	9.752128695034248
1994	9.769780100924658
1995	9.787431506849314
1996	9.909857876712328
1997	10.032284246575344
1998	10.154710616438356
1999	10.277136986301368
2000	10.399563356164384
2001	10.627507783321917
2002	10.855452210445206
2003	11.08339663760274
2004	11.311341064760274
2005	11.53928549191781
2006	11.767229919041094
2007	11.995174346198631
2008	12.223118773356163
2009	12.451063200513698
2010	12.679007627636988
2011	12.907534246575342
2012	12.907534246575342
2013	12.907534246575342
2014	12.907534246575342
2015	12.907534246575342
2016	12.907534246575342
2017	12.907534246575342
2018	12.907534246575342
2019	12.907534246575342
2020	12.907534246575342