Year	% of internal resources
1990	3.6818893347203647
1991	3.8748040818348444
1992	4.067718828949323
1993	4.260633576063803
1994	4.45352850844603
1995	4.6464630702927625
1996	4.8393480953088615
1997	5.032257888740278
1998	5.225167682171694
1999	5.418077475603111
2000	5.611036805865161
2001	5.949636523505226
2002	6.288236241145291
2003	6.626835958785357
2004	6.965435676425423
2005	7.304035394065488
2006	7.6426351117055535
2007	7.981234829345619
2008	8.319834546985682
2009	8.658434264625749
2010	8.997033982265814
2011	9.33563369990588
2012	9.674233417545945
2013	10.01283313518601
2014	10.351432852826076
2015	10.690032570466142
2016	11.028632288106206
2017	11.028632288106206
2018	11.028632288106206
2019	11.028632288106206
2020	11.028632288106206