Why the disk usage on Android and Windows Phone 8.1 is so different?

Hi guys, my teammates and I noticed this issue: when we build our app for Android, it takes about 70-80MB in disk space, but on Windows Phone 8.1 the built app is 3 times bigger, taking up to 240MB. Does anybody know why this is happening and how can we reduce the size of the Windows Phone build? Thank you in advance.