Year	% of internal resources
1994	20.00817494379726
1995	20.10695551461271
1996	20.205736085632537
1997	20.304516656447987
1998	20.403297227263437
1999	20.50207779828326
2000	20.600858369098713
2001	19.792560801144493
2002	18.984263233190273
2003	18.175965665236053
2004	17.36766809728183
2005	16.55937052932761
2006	15.751072961373392
2007	15.751072961373392
2008	15.751072961373392
2009	15.751072961373392
2010	15.751072961373392
2011	15.751072961373392
2012	15.751072961373392
2013	15.751072961373392
2014	15.751072961373392
2015	15.751072961373392
2016	15.751072961373392
2017	15.751072961373392
2018	15.751072961373392
2019	15.751072961373392
2020	15.751072961373392