Year	% of total primary
1981	72.9296798706055
1982	72.9211120605469
1983	72.5521469116211
1984	72.3963775634766
1985	71.9171829223633
2000	71.5329971313477
2001	71.5085678100586
2002	71.5075607299805
2003	71.5193328857422
2004	71.5329208374023
2007	72.7668533325195
2008	72.4763107299805
2009	72.4452667236328
2010	72.128662109375
2019	7.57905006408691
2020	9.3671703338623
2021	7.22404003143311
2022	8.75485992431641