Year	% of internal resources
1991	7.533635734604443
1992	8.119281925117246
1993	8.704928115630045
1994	9.290574306142847
1995	9.876220496655646
1996	9.967050708849081
1997	10.057880921042516
1998	10.14871113323595
1999	10.2395413461982
2000	10.330371558391635
2001	10.42120177058507
2002	10.512031982778504
2003	10.602862194971939
2004	10.693692407165372
2005	10.784522619358809
2006	10.875352832321058
2007	10.966183044514493
2008	11.057013256707927
2009	11.14784346890136
2010	11.14784346890136
2011	11.14784346890136
2012	11.14784346890136
2013	11.14784346890136
2014	11.14784346890136
2015	11.14784346890136
2016	11.14784346890136
2017	11.14784346890136
2018	11.14784346890136
2019	11.14784346890136
2020	11.14784346890136