CREATE TABLE table_204_634 (id DECIMAL, "tour" DECIMAL, "official title" TEXT, "venue" TEXT, "city" TEXT, "date\ start" TEXT, "date\ finish" TEXT, "prize money\ usd" DECIMAL, "report" TEXT)

which tour was the only one to take place in december ?
SELECT "official title" FROM table_204_634 WHERE "date\nfinish" = 12
SELECT "official title" FROM "table_204_634" WHERE "date\nfinish" = 12