Year	% of total teachers
2003	68.057991027832
2004	68.5339965820312
2005	62.7408485412598
2006	61.7700996398926
2010	57.3935203552246
2011	67.149543762207
2012	78.7775115966797
2017	81.2397918701172
2020	53.4140014648438
2021	81.6537628173828
2022	81.8988571166992