Year	% of total teachers
1999	67.1648101806641
2000	59.6086616516113
2001	64.1458969116211
2002	56.7713317871094
2003	59.6531410217285
2004	55.6921005249023
2005	52.5333786010742
2006	54.9257202148438
2007	56.4112701416016
2008	52.800350189209
2009	49.4836692810059
2010	51.501148223877
2011	50.9523887634277
2012	50.533878326416
2013	50.643798828125
2014	49.9773788452148
2015	51.9401016235352
2016	50.9557991027832
2017	52.1981391906738
2018	52.6223793029785
2019	56.8095016479492
2020	59.3000984191895
2021	60.7886199951172
2022	61.1168785095215