Year	% of internal resources
1985	2.272727272727273
1986	2.566558441558441
1987	2.8603896103896105
1988	3.154220779220779
1989	3.451948051948052
1990	3.741883116883117
1991	4.037337662337662
1992	4.134740259740259
1993	4.232142857142857
1994	4.329545454545455
1995	4.426948051948052
1996	4.332792207792209
1997	4.462662337662337
1998	4.592532467532467
1999	4.821428571428571
2000	4.765333530844155
2001	4.670816115259741
2002	4.576298701298701
2003	4.576298701298701
2004	4.576298701298701
2005	4.576298701298701
2006	4.576298701298701
2007	4.576298701298701
2008	4.576298701298701
2009	4.576298701298701
2010	4.576298701298701
2011	4.576298701298701
2012	4.576298701298701
2013	4.576298701298701
2014	4.576298701298701
2015	4.576298701298701
2016	4.576298701298701
2017	4.576298701298701
2018	4.576298701298701
2019	4.576298701298701
2020	4.576298701298701