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The unemployment rate hit a record 27.9 percent in September 2013 but has been gradually easing since then, although it remains the highest in the euro zone.
Seasonally adjusted data showed the number of unemployed at 977,222 people, with people aged up to 24 bearing the brunt of the joblessness.
Among those aged 15-24, the jobless rate eased to 42.3 percent from 47.1 percent in the same month in 2017.
The government expects unemployment to fall to 18.4 percent this year, based on projections in its 2018 budget.
Euro zone unemployment fell to a new nine-year low of 8.5 percent in February from 8.6 percent in January.