Year	% of internal resources
1998	0.8224825555342166
1999	0.8554448986620574
2000	0.8877030615197491
2001	0.9206654046475897
2002	0.9319688697266502
2003	0.9432723348697266
2004	0.9545757999487869
2005	0.9658792650918634
2006	0.9729210677933552
2007	0.9799628704948465
2008	0.9870046731963382
2009	0.9774732149670314
2010	0.9679417567377249
2011	0.958410298508418
2012	0.9404766893284681
2013	0.922543080148518
2014	0.9046094709045516
2015	0.8866758617246016
2016	0.8687422525446513
2017	0.8508086433647012
2018	0.8328750341847513
2019	0.8145445233979899
2020	0.8149414250048013