Year	% of total primary
1970	6.891930103302
1971	6.99519014358521
1972	7.13095998764038
1973	7.14278984069824
1974	7.37158012390137
1975	7.42534017562866
1976	7.41039991378784
1977	7.42082023620605
1978	7.41763019561768
1979	7.40883016586304
1980	7.39840984344482
1981	7.34322023391724
1982	7.20663976669312
1983	7.07153987884521
1984	6.82334995269775
1985	6.6641001701355
1986	6.6287899017334
1987	6.55764007568359
1988	6.37411022186279
1989	6.34944009780884
1990	6.26051998138428
1991	6.16882991790771
1992	6.07145977020264
1993	6.0786600112915
1994	6.18818998336792
1995	6.15898990631104
1996	6.33539009094238
1997	6.2997899055481
1998	6.28539991378784
1999	6.18215990066528
2000	6.22805976867676
2001	6.27728986740112
2002	6.32699012756348
2003	6.37540006637573
2004	6.29113006591797
2005	6.4727897644043
2006	6.53353977203369
2007	6.57804012298584
2008	6.60504007339478
2009	6.63813018798828
2010	6.59677982330322
2011	6.58064985275269
2012	6.85442018508911
2013	7.34416007995605
2014	7.6775598526001
2015	8.14151000976562
2016	8.4712495803833
2017	8.82277965545654
2018	9.22387981414795
2019	9.59387016296387
2020	9.91454982757568
2021	9.96988010406494
2022	9.98390007019043