Actually, you're all wrong. The order, last I checked, goes Mandarin > English > Hindi > Spanish... with German and French trailing somewhere down the list. This is of course speaking in terms of population and not considering academic or economic use. You'll find that most of the Nodel Peace Prizes for literature for example, have gone to either English or French writers.
But I digresss... let us reflect for a moment on Australian history. In 1788, the British formed a penal colony here and then nothing happened for 220 years. The end. Oh wait, we got into to some wars along the way that had nothing to do wth us, but that's only because we wanted the Americans to like us.