I dont live in norway so i cant say but the number of github users is also really high in norway if i remember right and most norwegians i know are pretty tech literate so i could believe this stat. But you never know how accurate the measurments are and how well your social group represents the whole country. For example hungary only has 3.4% while if i had to guess i would have said like 8~10% because i knew so many people who just used it because it was faster/worked better/was cheaper.