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The statistics office said prices rose 0.5 percent compared with the previous month.
Analysts had expected the CPI at 1.5 percent year-on-year and at 0.4 percent month-on-month in April.
Food and non-alcoholic beverage prices rose 4.0 percent in March, while month on month they rose 0.3 percent. Energy prices rose year-on-year by 1.6 percent, and held steady in monthly terms.
Petrol for private vehicles prices rose last month 1.3 percent year-on-year and rose 2.8 percent in monthly terms.