Year	% of total teachers
1999	29.1928806304932
2000	25.3924102783203
2001	23.941219329834
2002	22.2042903900146
2003	21.3480396270752
2004	11.7266101837158
2005	22.2306499481201
2006	24.1667900085449
2007	30.7908592224121
2008	25.3413906097412
2009	22.8908500671387
2010	26.8294200897217
2011	26.8290691375732
2012	35.0519790649414
2013	39.1415901184082
2014	41.1606483459473
2015	45.5477104187012
2018	54.5538482666016
2019	58.6487884521484
2020	63.094898223877
2021	60.9474105834961