Luxembourgers have resoundingly rejected a proposal to let foreign residents vote in national elections, a move that would have been a first in Europe and could have expanded the electorate of the tiny but cosmopolitan Grand Duchy by as much as 50 percent. In Sunday's consultative referendum, only about 22 percent supported the proposal, part of a modernizing agenda backed by liberal Prime Minister Xavier Bettel. There were also clear majorities against lowering the voting age to 16 from 18 and introducing 10-year term limits for ministers.