What is the fewest number of occ championships for the team that last won an outright occ championship in 2006?
CREATE TABLE "by_school" (
  "school" text,
  "years_of_participation" text,
  "occ_championships" real,
  "last_occ_championship" text,
  "last_outright_occ_championship" text
);
SELECT MIN("occ_championships") FROM "by_school" WHERE "last_outright_occ_championship"='2006';