The chart below is available for download:
| Date of General Election | Percentage Voter Turnout | Percentage Rejected Ballots | Total Enumerated |
|---|---|---|---|
| 30 May 1966 | 85.65% | 3.72% | 56,861 |
| 11 May 1970 | 87.32% | 5.01% | 65,201 |
| 29 April 1974 | 82.10% | 4.10% | 71,429 |
| 24 April 1978 | 86.30% | 2.00% | 74,857 |
| 23 April 1979 | 83.80% | 2.30% | 78,517 |
| 27 September 1982 | 78.20% | 3.00% | 87,473 |
| 21 April 1986 | 87.60% | 1.90% | 86,813 |
| 29 May 1989 | 80.80% | 1.90% | 89,230 |
| 29 March 1993 | 80.70% | 1.90% | 92,151 |
| 18 November 1996 | 85.48% | 0.46% | 94,015 |
| 17 November 2000 | 84.86% | 0.44% | 94,087 |
| 29 September 2003 | 83.27% | 0.50% | 97,180 |
| 28 May 2007 | 83.84% | 0.45% | 97,810 |
