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Average Size of One Teacher Classes, Maintained Schools 
| Primary | Secondary | |||||
| 1997 | 2007 | Difference | 1997 | 2007 | Difference | |
| Bath and North East Somerset LA | 27 | 26.2 | -0.8 | 20.7 | 21.1 | 0.4 |
| Bournemouth LA | .. | 27.3 | .. | .. | 22.1 | .. |
| Bristol LA | 27.2 | 26.3 | -0.9 | 21.1 | 21.8 | 0.7 |
| Cornwall LA | 27.3 | 26.2 | -1.1 | 22 | 21.3 | -0.7 |
| Devon LA | 27.4 | 25.5 | -1.9 | 21.4 | 21.4 | 0.0 |
| Dorset LA | 28.2 | 25.1 | -3.1 | 21.8 | 21 | -0.8 |
| Gloucestershire LA | 27.4 | 25.8 | -1.6 | 21.5 | 20.7 | -0.8 |
| Isles of Scilly LA | 17.3 | 14.4 | -2.9 | 21 | . | . |
| North Somerset LA | 27.8 | 27.3 | -0.5 | 20.4 | 22.3 | 1.9 |
| Plymouth LA | .. | 26.5 | .. | .. | 21 | .. |
| Poole LA | .. | 26.7 | .. | .. | 19.8 | .. |
| Somerset LA | 27.6 | 25.8 | -1.8 | 23.2 | 22.7 | -0.5 |
| South Gloucestershire LA | 28.5 | 26.9 | -1.6 | 21.5 | 20.7 | -0.8 |
| Swindon LA | .. | 26.9 | .. | .. | 23.6 | .. |
| Torbay LA | .. | 27 | .. | .. | 20 | .. |
| Wiltshire LA | 27.2 | 25.8 | -1.4 | 21.7 | 21 | -0.7 |
| South West Region | 27.5 | 26.1 | -1.4 | 21.7 | 21.4 | -0.3 |
| England | 27.5 | 26.2 | -1.3 | 21.7 | 21.2 | -0.5 |
The average size of classes taught by one teacher in Maintained Primary Schools in 2007 was 26.2 down from 27.5 in 1997.
In Maintained Secondary Schools the average size of classes taught by one teacher in 2007 21.2 down from 21.7 in 1997.