Year	% of total primary
1984	15.2540302276611
1985	11.5349397659302
1986	13.4571104049683
1987	15.8029804229736
1988	14.8714599609375
1989	15.2816801071167
1990	15.4859800338745
1991	16.3746700286865
1992	16.2797107696533
1994	16.469259262085
1995	16.8348197937012
1998	7.2166600227356
2000	14.5911598205566
2001	17.6417999267578
2002	13.3850898742676
2003	14.6227197647095
2004	16.4372806549072
2005	16.6929092407227
2007	21.5489292144775
2008	20.7754096984863
2009	19.9873695373535
2010	21.6306991577148
2011	20.8576698303223
2012	20.5953197479248
2013	19.6278400421143
2014	19.953010559082
2015	20.2890605926514
2016	22.6155490875244
2021	23.7115306854248