Year	% of internal resources
1990	9.898550724637682
1991	9.662281679710146
1992	9.42601263478261
1993	9.189743589855073
1994	8.953474544927536
1995	8.7172055
1996	8.480936455072465
1997	8.244667409661837
1998	8.0083983647343
1999	7.772129319806763
2000	7.535860274879227
2001	8.75981667294686
2002	9.983773070531402
2003	11.207729468599032
2004	11.827467218840578
2005	12.447204969082124
2006	13.06694271932367
2007	13.686680469082127
2008	14.306418219323671
2009	14.926155969565217
2010	15.545893719806763
2011	15.547826086956523
2012	15.54975845410628
2013	15.55169082125604
2014	15.553623188405796
2015	15.555555555555555
2016	19.47826086956522
2017	19.47826086956522
2018	19.47826086956522
2019	19.47826086956522
2020	19.47826086956522