The revised data came even as the WPI provisional figure for the week ended May 10 released today showed that the inflation rate declined marginally to 7.82 per cent over the 7.83 per cent in the previous week, but much higher than the 5.62 per cent recorded in the corresponding week a year ago.
With data for subsequent weeks also expected to be revised, the inflation rate is expected to be higher than the current 7.8 per cent levels.
"At the current rate of revision, the actual inflation rate may have already crossed 9 per cent," said Saugata Bhattacharya, vice-president, Axis Bank.
An analysis by Business Standard suggests that for the week ended May 17, for which data will be released next Friday, the inflation rate may range between 7.86 and 8.10 per cent.
Reacting to the data, Finance Minister P Chidambaram said: "Please be patient. We are watching the situation carefully. More steps will be taken as and when needed."
During the week under review, prices of fruit, vegetables, pulses