How common is flipped classroom type teaching? Flipped classroom teaching has become gradually more popular and studies show that the effectiveness of learning is better than in traditional lecture type courses. I've tried to give feedback to my own university after courses that this should be pursued, but so far there has been no changes here.

I'd like to know what percentage of courses are using flipped classrooms and how it varies between geographical location and subject/field. I would assume that fields with complex systems to learn would have greater benefits using flipped type compared to traditional lectures.
The question explicitly asked is not that suitable for this forum. There is a answerable question hidden however: How to encourage a specific teaching style in a university? 

Just "giving feedback to the university" will achieve exactly nothing. Universities are huge bureaucratic monsters with immense inertia build in. What you can do depends on your role in the university:

If you are teaching, then lead by example. In the universities I have been at there always was a department aimed at improving the quality of university teaching, and these are your natural allies. Contact them. Maybe they can broker contact with other teachers who want to do this or are already doing this. If you reach a critical mass, beautiful things can happen.

If you are a student then your options are fairly limited.