The prices that Japanese companies charge each other for services rose 0.9 per cent in September from a year earlier, marking a seventh straight month of gains, central bank data showed on Tuesday. The increase in the services producer price index was just below a 1.0% gain marked in August, the data showed. The key driver behind the September rise was transportation fees, with the cost of ocean freight transportation spiking 34.9 per cent from a year earlier and air freight up 28.5 per cent, the data showed.