Year	% of internal resources
1990	4.4609665427509295
1991	4.430408921933085
1992	4.399851301115241
1993	4.369293680297398
1994	4.338736059479554
1995	4.30817843866171
1996	4.812936802973978
1997	5.317695167286246
1998	5.822453531598513
1999	6.327211895910781
2000	6.8319702602230485
2001	6.50728624535316
2002	6.182602230483272
2003	5.857918215613383
2004	5.533234200743495
2005	5.208550185873606
2006	4.730185873605949
2007	4.638438661710038
2008	4.546691449814126
2009	4.454944237918216
2010	4.363197026022305
2011	4.271449814126394
2012	4.179702602230483
2013	4.087955390334573
2014	3.9962081784386623
2015	3.420074349442379
2016	4.059479553903346
2017	4.055762081784387
2018	3.5613382899628254
2019	4.204460966542751
2020	2.921933085501859