| Year | Grade A/B | Grade C | Grade D/E |
|---|---|---|---|
| 1951 |
34,884
|
79,278
|
57,008
|
| 1971 |
32,660
|
64,805
|
42,074
|
| 1981 |
39,859
|
66,365
|
37,643
|
| 1991 |
47,280
|
63,520
|
35,080
|
| 2001 |
42,201
|
103,468
|
49,789
|
| 2011 |
38,769
|
116,203
|
57,266
|
| Date: | Source: |
|---|---|
| 1951 - 2011 | Census of Population |
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