How much of the data transmitted or stored on any given system is actually text, as opposed to images, audio, video, machine code, application specific random s

How much of the data transmitted or stored on any given system is actually text, as opposed to images, audio, video, machine code, application specific random stuff? Of the little bit of text, how much is HTML, CSS, JSON, any programming language; all of which would be pretty much all ASCII? And if you can find a niche application where most of your data is CJK text, is it really so much that it fits on a USB pen drive if encoded in BIG-5 but not if encoded in UTF-8? My rough guesses at answers are 0.1%, 90%, and no. Besides, UTF-32 plus gzip isn't a bad solution, and completely ends all discussion about transfer formats... at the cost of requiring a compressor.