Year	% of internal resources
1990	31.719352351580575
1991	32.79215772659985
1992	33.864963101619125
1993	34.9377684766384
1994	36.01057385181188
1995	37.08337922683115
1996	38.15618460185043
1997	39.228989976869705
1998	40.37872012336161
1999	41.528450269853515
2000	42.67818041634542
2001	43.82791056283732
2002	44.97764070932922
2003	44.99254690316114
2004	45.00745309683886
2005	45.022359290670785
2006	45.022359290670785
2007	45.022359290670785
2008	45.022359290670785
2009	45.022359290670785
2010	45.022359290670785
2011	45.022359290670785
2012	45.022359290670785
2013	45.022359290670785
2014	45.022359290670785
2015	45.022359290670785
2016	45.022359290670785
2017	45.022359290670785
2018	45.022359290670785
2019	45.022359290670785
2020	45.022359290670785