India's economy logged around 5.5 percent growth in the last financial quarter, the finance minister estimated on Saturday -- a rate that could boost calls for lower interest rates to spur activity. India's once-booming economy has been hit by high interest rates, Europe's debt crisis that has slowed exports, and sluggish investment caused by domestic and overseas concerns about policy and corruption. Chidambaram said in televised remarks in the western Indian city of Pune that he expected official data to be released next Friday to show that the economy grew by "around 5.5 percent" in the three months to September 30. That would be down from 6.9 percent in the same second-quarter period a year earlier. "It goes without saying that we face a difficult situation," Chidambaram said at a bankers' conference, adding that the "global economy is still in crisis". India's economy was growing by more than eight percent before 2011-12. But it has been performing increasingly worse with the Congress-led government of Prime Minister Manmohan widely criticised for its handling of the situation. Even though 5.5-percent growth would be the envy of much of the world, it is not enough for India, which has been aiming for close to double-digit expansion to substantially reduce crushing poverty. "For us eight percent growth is not an aspiration but a necessity. India cannot afford to grow below eight percent," Chidambaram said. The slow growth comes at a time when it is more difficult for the Indian government to pep up the economy than in the 2008-09 financial crisis. Then, the government had more fiscal room to stimulate the economy but now it is struggling to cut a widening budget deficit and avert a downgrade of its sovereign debt to "junk" status by global credit ratings agencies. In addition, the central bank has been keeping interest rates high to combat stubbornly high inflation. Indian inflation eased marginally in October to 7.45 percent year-on-year, but economists said that the level was still too high to permit the bank to lower rates. Indian businesses have been calling for lower rates, saying India's economic slowdown is in large part due to the high cost of borrowing that has curbed consumer spending.