CREATE TABLE table_1819 ("Club" TEXT, "First season in top division" TEXT, "Number of seasons in top division" FLOAT, "First season of current spell in top division" TEXT, "Number of seasons in Liga MX" FLOAT, "Top division titles" FLOAT)

How many top division titles were won during the 'first season of current spell in top division' in 1979-80?
SELECT "Top division titles" FROM table_1819 WHERE "First season of current spell in top division" = '1979-80'
SELECT "Top division titles" FROM "table_1819" WHERE "First season of current spell in top division" = '1979-80'