Year	% of internal resources
1992	13.920484581497798
1993	14.21776274387665
1994	14.515040906211455
1995	14.812319068590307
1996	15.109597230969163
1997	15.406875393348018
1998	15.704153555682817
1999	16.001431718061674
2000	18.502202643171806
2001	18.034875183568282
2002	17.567547723920704
2003	17.10022026431718
2004	17.4176578560793
2005	17.735095447885463
2006	18.052533039647578
2007	18.268557268722468
2008	18.484581497797357
2009	19.88105726872247
2010	20.687224669603523
2011	21.46916299559471
2012	22.251101321585903
2013	22.572687224669604
2014	22.894273127753305
2015	23.66079295154185
2016	26.25991189427313
2017	25.89823127753304
2018	26.91347136563877
2019	27.107303964757712
2020	27.107303964757712