How many Seats 2005 has a Percentage in/de-crease of 50.0%, and a Governorate of dhi qar governorate, and a In/de-creased by larger than 6?
CREATE TABLE "seat_allocation" (
  "governorate" text,
  "seats_2010" real,
  "seats_2005" real,
  "in_de_creased_by" real,
  "percentage_in_de_crease" text
);
SELECT SUM("seats_2005") FROM "seat_allocation" WHERE "percentage_in_de_crease"='50.0%' AND "governorate"='dhi qar governorate' AND "in_de_creased_by">6;