Year	% of internal resources
1995	2.368021360172237
1996	2.4083462046596895
1997	2.4494293654870445
1998	2.4905125263144012
1999	2.5308115584389186
2000	2.582592527446093
2001	2.6569973955406616
2002	2.845942244720944
2003	2.9157646418005014
2004	2.976222510344849
2005	3.034524722585192
2006	3.0631763344739813
2007	3.089646486346743
2008	3.1310989492057812
2009	3.156359735992198
2010	3.1887692559942837
2011	3.2109983138471896
2012	4.577921926358509
2013	4.543117530862766
2014	4.668194275293516
2015	4.792427327454855
2016	4.8681288611010505
2017	4.881812885221079
2018	4.917537760719803
2019	4.937528069818431
2020	4.9546753019285035