Year	% of total primary
1971	10.9243402481079
1972	10.4019899368286
1981	4.95498991012573
1982	4.87840986251831
1983	4.78562021255493
1984	7.33675003051758
1986	4.80864000320435
1987	4.87123012542725
1990	5.53734016418457
1991	5.76234006881714
1994	6.2485499382019
1996	6.51680994033813
1997	6.6904501914978
2001	8.87012004852295
2003	8.9500904083252
2004	7.97066020965576
2005	7.2625298500061
2006	7.81434011459351
2007	7.78797006607056
2014	8.44876956939697
2016	8.93336963653564
2017	9.10888004302979
2018	9.22012042999268
2019	9.35179996490479
2020	9.41427040100098
2021	8.89011001586914
2022	8.68686008453369