Year	% of total primary
1970	5.31024980545044
1971	5.31765985488892
1972	5.22378015518188
1973	5.07460021972656
1974	4.90714979171753
1975	4.54114007949829
1976	4.362380027771
1977	4.23773002624512
1978	4.28114986419678
1979	4.28791999816895
1980	4.27224016189575
1981	4.2704701423645
1982	4.30371999740601
1983	4.34810018539429
1984	4.37455987930298
1985	4.4247899055481
1986	4.45714998245239
1987	4.57936000823975
1988	4.66160011291504
1989	4.73065996170044
1990	4.80272006988525
1991	4.82301998138428
1992	4.86932992935181
1993	4.89786005020142
1994	5.01619005203247
1995	5.07262992858887
1996	5.19010019302368
1997	5.26822996139526
1998	5.48185014724731
1999	5.67994022369385
2000	5.6781702041626
2001	5.96886014938354
2002	6.39059019088745
2003	6.83662986755371
2004	6.89719009399414
2005	7.33095979690552
2006	7.5752100944519
2007	8.19188976287842
2008	8.32085037231445
2009	8.68562984466553
2010	9.04996967315674
2011	9.42695999145508
2012	9.73943996429443
2013	10.1038398742676
2014	10.5364599227905
2015	10.9646701812744
2016	11.2124099731445
2017	11.3416996002197
2018	11.7197599411011
2019	11.9425001144409
2020	12.0531196594238
2021	11.7621097564697
2022	11.7465295791626