CREATE TABLE table_66072 ("Period" TEXT, "Internet Explorer" TEXT, "Firefox" TEXT, "Chrome" TEXT, "Safari" TEXT, "Opera" TEXT, "Other Mozilla" TEXT, "Mobile" TEXT)

What percentage of users were using mobile browsers during the period in which 2.62% were using Opera?
SELECT "Mobile" FROM table_66072 WHERE "Opera" = '2.62%'
SELECT "Mobile" FROM "table_66072" WHERE "Opera" = '2.62%'