Year	% of internal resources
1970	3.08411214953271
1971	3.1308411214953273
1972	3.177570093457944
1973	3.224299065420561
1974	3.2710280373831773
1975	3.3177570093457938
1976	3.345794392523364
1977	3.3738317757009346
1978	3.4018691588785046
1979	3.429906542056075
1980	3.4579439252336446
1981	3.514018691588785
1982	3.570093457943925
1983	3.6261682242990654
1984	3.6822429906542054
1985	3.7383177570093453
1986	3.4256074766355145
1987	3.1128971962616823
1988	2.80018691588785
1989	2.4874766355140188
1990	2.174766355140187
1991	2.223177570093458
1992	2.271588785046729
1993	2.3200000000000003
1994	2.368411214953271
1995	2.416822429906542
1996	2.3564719626168222
1997	2.2961214953271027
1998	2.2357710280373833
1999	2.1754205607476638
2000	2.743511348504673
2001	3.3116021361682244
2002	3.879692923925234
2003	4.442947262990655
2004	5.006201602149533
2005	5.569455941214954
2006	6.132710280373832
2007	5.734392523364486
2008	5.33607476635514
2009	4.937757009345795
2010	4.539439252336448
2011	4.141121495327103
2012	3.742803738317757
2013	3.3444859813084107
2014	2.9461682242990657
2015	2.5478504672897193
2016	2.1495327102803734
2017	2.1495327102803734
2018	2.616822429906542
2019	2.803738317757009
2020	2.803738317757009