Year	% of total teachers
1998	81.7635879516602
1999	83.7960510253906
2000	87.5226364135742
2001	91.2390518188477
2002	94.9642333984375
2003	95.5569305419922
2004	90.3725204467773
2005	96.9583587646484
2006	98.9094619750977
2007	99.1241683959961