Which source date has an Internet Explorer usage of 60.2%?
CREATE TABLE "europe_usage_share_data_from_at_internet" (
  "date" text,
  "internet_explorer" text,
  "firefox" text,
  "opera" text,
  "safari" text,
  "source" text
);
SELECT "source" FROM "europe_usage_share_data_from_at_internet" WHERE "internet_explorer"='60.2%';