The price index was up 2.9 percent in the year to May.
The price index had been 2.5 percent lower in May than a year earlier.
Over the first three months, the price index rose 5.3 percent.
Where is the rate of change in a price index over the previous period.
Energy, which makes up 7 percent of the price index, is also a big cost to farmers.
But he added, "We plan to develop a price index based on economic performance for the entire year."
The price index closed at 2,100, up almost 98 points from the Thursday close.
Over the last 12 months, the price index has risen by 4.2 percent.
However, the price index for fuels and energy was still 5.3 percent above the mark a year earlier.
There is, however, the problem of deciding which price index to use.
