A 4 percent raise is in store for the city’s emergency medical technicians and paramedics, the largest increase in its 45-year history, officials said Wednesday.Mayor Mike Duggan unveiled the three-year collective bargaining agreement amendment alongside Fire Commissioner Eric Jones and fire union officials outside St. John Hospital on Moross.The agreement, which includes the across-the-board raises, was ratified Monday by EMS members and approved Tuesday by Detroit’s city council.Under the new contract, the city will provide the 4 percent raise for all 213 EMS Division field staff. The agreement also includes an attendance incentive program that kicks in Jan. 1, 2018, officials announced.