Year	% of total primary
1970	11.0451498031616
1971	11.0470695495605
1972	10.680100440979
1973	10.5548095703125
1974	10.7392501831055
1975	10.6331300735474
1976	10.7640695571899
1977	10.4017400741577
1978	10.1708698272705
1979	9.87814998626709
1980	9.69204998016357
1981	9.42393970489502
1982	9.12594032287598
1983	8.85717964172363
1984	8.53544044494629
1985	8.34661960601807
1986	8.66263008117676
1987	8.70578956604004
1988	8.77900981903076
1989	8.93443012237549
1990	9.05967998504639
1991	8.75817966461182
1992	8.87845039367676
1993	8.95279979705811
1994	9.00685977935791
1995	9.52299022674561
1996	9.72439956665039
1997	9.79374980926514
1998	9.88619995117188
1999	9.92257976531982
2000	9.86653995513916
2001	9.86137008666992
2002	9.76895046234131
2003	9.74643993377686
2004	9.74894046783447
2005	9.81824970245361
2006	9.8209400177002
2007	9.82843017578125
2008	9.81884002685547
2009	9.7611198425293
2010	9.80945014953613
2011	9.78258991241455
2012	9.93313026428223
2013	10.2088403701782
2014	10.4336004257202
2015	10.8121900558472
2016	11.2190799713135
2017	11.554220199585
2018	11.8186902999878
2019	12.1070699691772
2020	12.229419708252
2021	12.4018297195435
2022	12.4178400039673