CREATE TABLE table_64838 ("Japanese Title" TEXT, "English Title" TEXT, "Year" FLOAT, "First publisher" TEXT, "ISBN" TEXT)

What Year has an ISBN OF ISBN 4-06-182042-7?
SELECT AVG("Year") FROM table_64838 WHERE "ISBN" = 'isbn 4-06-182042-7'
SELECT AVG("Year") FROM "table_64838" WHERE "ISBN" = 'isbn 4-06-182042-7'