CREATE TABLE table_13302 ("Period" TEXT, "Internet Explorer" TEXT, "Firefox" TEXT, "Safari" TEXT, "Opera" TEXT, "Netscape" TEXT, "Other Mozilla" TEXT)

What percentage of users were using Safari during the period in which 2.33% were using Opera?
SELECT "Safari" FROM table_13302 WHERE "Opera" = '2.33%'
SELECT "Safari" FROM "table_13302" WHERE "Opera" = '2.33%'