CREATE TABLE table_203_788 (id DECIMAL, "year" DECIMAL, "author" TEXT, "illustrator" TEXT, "title" TEXT, "publisher" TEXT)

how many number of titles are listed for the year 1991 ?
SELECT COUNT(DISTINCT "title") FROM table_203_788 WHERE "year" = 1991
SELECT COUNT(DISTINCT "title") FROM "table_203_788" WHERE "year" = 1991