Year	% of internal resources
1992	20.69236821400472
1993	17.356412273800156
1994	14.020456333595593
1995	10.68450039339103
1996	10.746768573564122
1997	10.809036753737214
1998	10.871304933910308
1999	10.93357311487018
2000	10.995841295043272
2001	11.058109475216364
2002	11.120377655389456
2003	11.782061369000786
2004	12.443745082612114
2005	13.105428796223444
2006	13.767112509834774
2007	14.428796223446106
2008	12.619984264358772
2009	10.841856805664829
2010	14.492525570416994
2011	14.744295830055073
2012	12.832415420928402
2013	13.752950432730133
2014	13.532651455546812
2015	12.709226121164436
2016	13.77970102281668
2017	14.043273013375293
2018	12.655704169944926
2019	7.918568056648309
2020	6.710875688434303