Compared with the previous month, the number of unemployed declined by 0.7 percent to 989 thousand and the number of employed increased by 0.2 percent to 3.76 million.
A year earlier, the unemployment rate was recorded at 23.4 percent. The number of unemployed persons fell by 11.4 percent while employment grew by 2.9 percent.
The 15-24 age group recorded the highest unemploment rate (45.0 percent vs 46.7 percent in December 2016), followed by the 25-34 age group (25.9 percent vs 29.6 percent), the 35-44 age group (18.7 percent vs 20.2 percent), the 55-64 age group (16.9 percent vs 19.9 percent), the 45-54 age group (16.2 percent vs 18.7 percent) and the 65-74 age group (10.8 percent vs 14.3 percent).
The unemployment rate among women decreased to 25.8 percent in December from 27.9 percent a year earlier, while among men it fell to 16.9 percent from 19.8 percent.
Among the country's regions, the highest unemployment rates were reported for Epirus-Western Macedonia (25.8 percent), followed by Peloponnese, Western Greece and Ionian Islands (21.7 percent), Attica and Macedonia-Thrace (both 21.1 percent) and Aegean Islands (20.5 percent); while Crete recorded the lowest rate (16.0 percent).
Unemployment has fallen since the jobless rate hit a high of 27.9 percent in September 2013, but remains the highest in the Eurozone.