CREATE TABLE table_69917 ("Deputy Prime Minister" TEXT, "Took office" FLOAT, "Left office" TEXT, "Prime Minister" TEXT, "Term" TEXT, "Party" TEXT)

What year did deputy prime minister Mariano Rajoy Brey take office?
SELECT SUM("Took office") FROM table_69917 WHERE "Deputy Prime Minister" = 'mariano rajoy brey'
SELECT SUM("Took office") FROM "table_69917" WHERE "Deputy Prime Minister" = 'mariano rajoy brey'