What percentage of users were using other browsers according to the source that reported 21.22% were using Firefox?
CREATE TABLE "usage_share_of_desktop_browsers_for_june" (
  "source" text,
  "chrome" text,
  "internet_explorer" text,
  "firefox" text,
  "safari" text,
  "opera" text,
  "other" text
);
SELECT "other" FROM "usage_share_of_desktop_browsers_for_june" WHERE "firefox"='21.22%';