By Tarek Amara and Angus McDowall TUNIS (Reuters) -Tunisia announced that a mere 11% of the electorate had voted on Sunday in parliamentary runoffs in which critics of President Kais Saied pointed to empty polling stations as evidence of public disdain for his agenda and seizure of powers. The head of the electoral commission, over which Saied assumed ultimate authority last year, gave a provisional turnout of 11.3% for Sunday’s runoff votes. During December’s first round, the official turnout was only slightly lower, at 11.2%. Economic decline in Tunisia, where some basic goods have disappear…