| Year | Grade A/B | Grade C | Grade D/E |
|---|---|---|---|
| 1951 |
3,308,709
|
9,936,978
|
5,647,286
|
| 1971 |
3,826,500
|
8,528,310
|
4,439,680
|
| 1981 |
4,461,497
|
7,753,376
|
3,776,876
|
| 1991 |
5,264,087
|
6,683,144
|
3,239,871
|
| 2001 |
4,895,050
|
9,448,169
|
4,972,764
|
| 2011 |
4,742,904
|
11,197,535
|
5,108,998
|
| Date: | Source: |
|---|---|
| 1951 - 2011 | Great Britain Historical GIS Project |
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