| Year | Grade A/B | Grade C | Grade D/E |
|---|---|---|---|
| 1951 |
213,582
|
700,238
|
373,011
|
| 1971 |
187,454
|
430,317
|
265,101
|
| 1981 |
181,871
|
296,769
|
177,472
|
| 1991 |
236,320
|
208,800
|
118,690
|
| 2001 |
302,174
|
401,851
|
222,108
|
| 2011 |
391,356
|
510,980
|
257,806
|
| Date: | Source: |
|---|---|
| 1951 - 2011 | Census of Population |
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