Year	% of internal resources
2002	1.5212201591511936
2003	1.6236453201591512
2004	1.6097385374005304
2005	1.632474422015915
2006	1.68264494137931
2007	1.7267146647214853
2008	1.7588859416445624
2009	1.8297082228116708
2010	1.790450928381963
2011	1.7822281167108753
2012	1.7533156498673739
2013	1.8697612732095488
2014	1.8339522546419098
2015	1.812997347480106
2016	1.76631299734748
2017	1.7848806366047747
2018	1.7851458885941645
2019	1.7771883289124668
2020	1.7639257294429709