Year	% of total primary
1970	0.112640000879765
1971	0.118359997868538
1972	0.118320003151894
1973	0.121550001204014
1974	0.125029996037483
1975	0.125290006399155
1976	0.124609999358654
1977	0.122900001704693
1978	0.119460001587868
1979	0.118299998342991
1980	0.114650003612041
1981	0.113260000944138
1982	0.111419998109341
1983	0.105400003492832
1984	0.0936599969863892
1985	0.09689000248909
1986	0.110679998993874
1987	0.131040006875992
1988	0.147949993610382
1989	0.160630002617836
1990	0.179590001702309
1991	0.18911999464035
1992	0.197500005364418
1993	0.232199996709824
1994	0.261330008506775
1995	0.294820010662079
1996	0.335999995470047
1997	0.384909987449646
1998	0.446819990873337
1999	0.502219974994659
2000	0.568570017814636
2001	0.645829975605011
2002	0.7430300116539
2003	0.804270029067993
2004	0.86778998374939
2005	0.972169995307922
2006	1.09472000598907
2007	1.19021999835968
2008	1.27634000778198
2009	1.34352004528046
2010	1.40050005912781
2011	1.48039996623993
2012	1.54408001899719
2013	1.66895997524261
2014	1.78255999088287
2015	1.9351099729538
2016	2.0924699306488
2017	2.08245992660522
2018	2.20260000228882
2019	2.36302995681763
2020	2.37391996383667
2021	2.39263010025024
2022	2.40319991111755