Year	% of total primary
1971	25.773889541626
1972	25.773889541626
1983	33.5302810668945
1991	33.7845497131348
1992	32.5951194763184
1994	35.371898651123
1995	34.1131706237793
1996	32.8578987121582
1997	32.5690498352051
1999	31.0088996887207
2000	30.1294803619385
2001	29.874059677124
2004	26.2698001861572
2008	24.8380107879639
2009	22.8633594512939
2010	22.4175796508789
2011	21.8181800842285
2012	20.8946800231934
2013	21.220760345459
2014	21.4611892700195
2015	28.9943809509277
2016	29.9850101470947
2017	30.7730407714844
2018	30.7730407714844
2019	30.2664699554443
2020	30.4414005279541
2021	31.5217399597168
2022	32.5153388977051
2023	34.1403198242188