What is the Market Share that has Assets of 25 Million and a rank of 23?
CREATE TABLE "tier_i_financial_institutions" (
  "rank" text,
  "bank" text,
  "assets_usd_millions" real,
  "market_share" text,
  "number_of_branches" real
);
SELECT "market_share" FROM "tier_i_financial_institutions" WHERE "assets_usd_millions"=25 AND "rank"='23';