Year	% of internal resources
1995	13.669989506820567
1996	13.683278880115427
1997	13.696568253410286
1998	13.70985762670514
1999	13.723146999999999
2000	13.736436373294861
2001	13.748676428384051
2002	13.76196580167891
2003	13.775255174973767
2004	13.788544548268625
2005	13.801833921563485
2006	13.815123294858346
2007	12.949370409233998
2008	15.05207240293809
2009	15.88772298006296
2010	15.78948058761805
2011	16.611140258919203
2012	17.43279992995803
2013	18.252885624344177
2014	18.252885624344177
2015	18.252885624344177
2016	18.252885624344177
2017	18.252885624344177
2018	18.252885624344177
2019	18.252885624344177
2020	18.252885624344177