Counting Cells If Special Criterias Are True

I have a worksheet containing appr. 9000 part numbers that have four different columns as: annual volume, dispatch quantity and turn over speed.

I want to count all rows where these conditions are true:

(annual volume / dispatch quantity)>turn over speed

I thought I could do something like this but it turns out wrong:

=COUNTIF((annual volume/dispatch quantity); >turn over speed)

This does not work.
Is there a way that I can do this easily?

note: the " ;" is correct. In my excel I use ; instead of " , ".