Year	% of total teachers
1999	53.6519889831543
2000	59.7741203308105
2002	75.4560470581055
2004	77.3848419189453
2005	77.0954666137695
2006	76.0747375488281
2007	77.0914688110352
2008	78.3295211791992
2009	95.5557708740234
2010	95.2046813964844
2011	95.3211212158203
2012	85.0315170288086
2013	75.3085327148438
2014	75.3098831176758
2015	81.538459777832
2016	81.5367126464844
2017	83.6790771484375
2018	89.9917907714844
2019	89.9497833251953
2020	90.0576324462891
2021	100
2022	0