What is the name of the rollercoaster that opened in 2004 in bobbejaanland?
CREATE TABLE "roller_coasters" (
  "name" text,
  "model" text,
  "park" text,
  "opened" text,
  "status" text
);
SELECT "name" FROM "roller_coasters" WHERE "opened"='2004' AND "park"='bobbejaanland';