These industries won't buy macs as they are too expensive to maintain and to integrate into their existing active directory domains. (With a few exceptions for jobs where the Mac is the optimal device like graphic design)
No idea about percentage but windows won't disappear soon from those.
The android market share is mainly mobile devices and Microsoft gave that market up a few years ago, focusing on azure and office. Here again, focusing the corporate/gouv world.
The corporate/gouv world has many windows only app and processes that would cost a fortune to replace.
Windows is here to stay, just like mainframes.