Year	% of total primary
1970	12.0389003753662
1971	12.1522998809814
1972	12.3072700500488
1973	12.3054103851318
1974	12.6295900344849
1975	12.6535701751709
1976	12.5843496322632
1977	12.5918102264404
1978	12.6176500320435
1979	12.7590503692627
1980	12.9003000259399
1981	12.9457397460938
1982	12.7824201583862
1983	12.6274499893188
1984	12.3446998596191
1985	12.1046199798584
1986	12.1494598388672
1987	12.105580329895
1988	11.8848600387573
1989	11.8976202011108
1990	11.9241800308228
1991	11.9355201721191
1992	11.8630599975586
1993	11.8125696182251
1994	11.9947299957275
1995	11.9391202926636
1996	12.2978401184082
1997	12.0479497909546
1998	11.8598203659058
1999	11.7934999465942
2000	11.7157201766968
2001	11.7341804504395
2002	11.7920999526978
2003	11.7551298141479
2004	11.7429504394531
2005	11.7767496109009
2006	11.6803503036499
2007	11.5941696166992
2008	11.6297702789307
2009	11.602499961853
2010	11.5296401977539
2011	11.4673700332642
2012	11.6642799377441
2013	11.6771602630615
2014	11.7908296585083
2015	11.8933601379395
2016	12.0343503952026
2017	12.1037998199463
2018	12.2098798751831
2019	12.3211002349854
2020	12.6944599151611
2021	12.7328500747681
2022	12.6880903244019