Year	% of internal resources
1975	267.85714285714283
1976	280.5357142857142
1977	293.2142857142857
1978	305.89285714285717
1979	318.57142857142856
1980	331.25
1981	343.9285714285714
1982	356.60714285714283
1983	369.28571428571433
1984	381.9642857142857
1985	394.6428571428571
1986	407.3214285714285
1987	420
1988	432.67857142857144
1989	445.35714285714283
1990	341.9642857142857
1991	339.46428571428567
1992	336.9642857142857
1993	334.4642857142857
1994	286.9642857142857
1995	287.9166666071429
1996	288.86904767857146
1997	289.8214285714286
1998	290.7738094642857
1999	291.7261905357143
2000	292.6785714285714
2001	311.64285714285717
2002	333.46428571428567
2003	353.8571428571429
2004	374.25
2005	387.5
2006	394.91071428571433
2007	402.32142857142856
2008	409.73214285714283
2009	417.14285714285717
2010	424.55357142857144
2011	431.9642857142857
2012	439.375
2013	446.7857142857143
2014	450.1785714285714
2015	446.42857142857144
2016	447.8571428571429
2017	446.42857142857144
2018	446.42857142857144
2019	446.42857142857144
2020	446.42857142857144