17.1 % were of German , 12.4 % Finnish , 10.5 % Norwegian , 9.4 % Italian , 6.4 % Swedish and 5.9 % Irish ancestry .
17.1 % were German , 12.4 % Finnish , 10.5 % Norwegian , 9.4 % Italian , 6.4 % Swedish and 5.9 % of Irish extraction .