How many years did the school have a mathetmatics score of 98.02?
CREATE TABLE "table1_2534578_1" (
  "school_year" text,
  "language" text,
  "science" text,
  "reading" text,
  "mathematics" text,
  "social_studies" text
);
SELECT COUNT("science") FROM "table1_2534578_1" WHERE "mathematics"='98.02';