Year	% of internal resources
1975	115.22727272727273
1976	115.36079545454545
1977	115.49431818181819
1978	115.6278409090909
1979	115.76136363636363
1980	115.89488636363636
1981	116.02272727272727
1982	116.15056818181817
1983	116.27840909090908
1984	116.40625
1985	116.5340909090909
1986	117.54545454545453
1987	118.55681818181819
1988	119.56818181818181
1989	120.57954545454545
1990	121.59090909090908
1991	128.1818181818182
1992	134.77272727272725
1993	141.36363636363635
1994	147.95454545454544
1995	154.54545454545453
1996	161.1363636363636
1997	167.70624999999998
1998	174.29715909090908
1999	180.88806818181817
2000	187.47897727272724
2001	182.2020698051136
2002	176.92516233778406
2003	171.64825487017043
2004	166.37134740255678
2005	161.09443993494318
2006	155.81753246761363
2007	150.54062499999998
2008	145.26371753238635
2009	139.9868100650568
2010	134.70990259744318
2011	129.43299512982952
2012	124.14188311676135
2013	118.8649756494318
2014	113.58806818181817
2015	99.1590909090909
2016	109.4034090909091
2017	122.33806818181819
2018	95.35227272727272
2019	160.83522727272725
2020	160.83522727272725