| Year | Grade A/B | Grade C | Grade D/E |
|---|---|---|---|
| 1951 |
124,573
|
515,387
|
242,858
|
| 1971 |
147,696
|
465,096
|
231,177
|
| 1981 |
159,265
|
373,392
|
194,391
|
| 1991 |
176,474
|
304,105
|
149,451
|
| 2001 |
157,595
|
369,711
|
250,657
|
| 2011 |
145,027
|
436,973
|
270,070
|
| Date: | Source: |
|---|---|
| 1951 - 2011 | Census of Population |
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