Pupil-teacher ratio. Secondary is the number of pupils enrolled in secondary school divided by the number of secondary school teachers.
| Date | Value | Change, % |
|---|---|---|
| 2011 | 20.9 | -2.61% |
| 2010 | 21.4 | -2.19% |
| 2009 | 21.9 | 4.82% |
| 2008 | 20.9 | -6.51% |
| 2007 | 22.3 | 23.91% |
| 2005 | 18.0 | 9.47% |
| 2003 | 16.5 | -18.32% |
| 1985 | 20.2 | 5.63% |
| 1984 | 19.1 | -8.18% |
| 1976 | 20.8 | -8.37% |
| 1974 | 22.7 |
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