CREATE TABLE table_66073 ("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 9.00% were using Chrome?
SELECT "Mobile" FROM table_66073 WHERE "Chrome" = '9.00%'
SELECT "Mobile" FROM "table_66073" WHERE "Chrome" = '9.00%'