THE stock exchange has started to release corrected figures for market turnover, ending years of turnover figures being consistently wrong by up to 10 per cent. An exchange spokesman yesterday said unspecified ''extra resources'' now meant that it would release adjusted turnover figures, corrected for keying errors and other mistakes at brokerages, known as trade amendments. Brokerages get a day to report these changes to the exchange. The spokesman said such figures changed the turnover by ''on average five to 10 per cent. In some cases up, in some cases down''. The corrected figures will appear in the daily quotations sheet. Thursday's turnover, initially said to be $5,048.82 million, was corrected yesterday to $5,354.86 million, a revision of more than $300 million, or 6.1 per cent.