Markit Economics released its manufacturing purchasing managers' index (PMI) for Greece on Wednesday. Greece's manufacturing purchasing managers' index (PMI) dropped to 48.4 in May from 49.7 in April.

The drop was driven by declines in output, new orders and employment.

"The fall in demand for Greek goods, from both domestic and international markets, continued to take its toll on goods producers and remains a key roadblock for a future economic recovery," Markit economist Samuel Agass said.