Year	% of total primary
1970	91.2402420043945
1971	91.4939498901367
1972	91.4333877563477
1973	90.5206832885742
1974	88.5176162719727
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	1.88409996032715
1991	1.28280997276306
1992	1.97362005710602
1993	1.98520994186401
1994	2.29038000106812
1995	2.75164008140564
1996	3.01435995101929
1997	3.51903009414673
1998	3.68658995628357
1999	4.70244979858398
2000	4.31920003890991
2001	3.89491009712219
2002	4.21905994415283
2003	4.68502998352051
2007	6.18231010437012
2008	7.76531982421875
2009	8.16326999664307
2010	8.82353019714355
2011	8.84416007995605
2012	9.98736000061035
2013	10.5390501022339
2014	10.7126598358154
2015	11.1098699569702
2016	10.8915300369263
2017	11.2426700592041
2018	11.6439800262451
2019	12.9276399612427
2020	13.6922903060913
2021	14.606499671936
2022	14.877329826355