Year	% of internal resources
1993	23.060076045627376
1994	21.960456273764255
1995	20.86083650190114
1996	19.907604562737642
1997	18.954372623574145
1998	18.065551330798478
1999	17.176730038022814
2000	16.287908745247147
2001	15.39908745247148
2002	14.510266159695817
2003	14.603802281368822
2004	14.697338403041826
2005	14.790874524714829
2006	14.884410646387833
2007	14.977946768060837
2008	15.11787072243346
2009	14.806083650190113
2010	14.836501901140684
2011	14.349809885931558
2012	13.995437262357413
2013	12.549809885931559
2014	12.547528517110266
2015	12.167300380228136
2016	12.431939163498098
2017	12.395437262357413
2018	12.091254752851711
2019	11.452471482889734
2020	10.387832699619773