This percentage (26.1) places Greece at the second higher position between EU countries after Italy (31,1%) while Croatia and Rumania are third at 24,1%, followed by Bulgaria (24%), Spain and Cyprus(22,2%)
Opposite to those placements are Holland at 7,2%, Luxembourg at 8,8% and Denmark, Sweden and Germany at 9,3%.
Overall in Europe, almost 5ml young adults are facing the situation known as NEET (Neither in employment or in Education and Training).
The actual data are available here