Year	% of internal resources
1995	28.11901681759379
1996	26.416558861578267
1997	24.71410090556274
1998	23.011642949547216
1999	21.309184993531694
2000	19.60672703751617
2001	17.904269081500644
2002	17.24514877102199
2003	16.586028460543336
2004	15.926908150064682
2005	15.267787839586028
2006	14.956015523932727
2007	14.644243208279429
2008	11.996119016817593
2009	9.347994825355757
2010	6.69987063389392
2011	4.051746442432083
2012	3.4721862871927556
2013	2.892626131953428
2014	2.3130659767141006
2015	2.469598965071151
2016	1.9915912031047862
2017	1.6752910737386804
2018	1.6454721862871928
2019	1.6454721862871928
2020	1.6454721862871928