Singapore has a few straightish bits where I think the likes of Red Bull will use the DRS as much as possible, but I can’t think of as many in Monaco. So, I’d guess Monaco would have the fewest. Monaco has a narrow track, bumpiness and elevation changes too which would all put drivers off DRS I reckon.
Although that being said, with the high-downforces used on these street circuits, the DRS will probably have a much greater effect in terms of reduction of drag so the drivers may push their luck with it.
For the remaining tracks and where I’d be guessing:
Great Britian: 7
Abu Dhabi: 7
We’ve seen so far that any little straight the drivers are all over the DRS button. Will be interesting too whether through certain corners some cars e.g Red Bull, will keep the DRS activated, I’m thinking Eu Rougue, 130R, Turns 8,9 at Nurburgring, even Copse?
Singapore should be interesting. An optimistic count is at least 10 DRS activations: T3-5 (Republic Boulevard), exit of T5 (Raffles Boulevard), exit of T7, exit of T8, exit of T9, exit of T13 (Esplanade Drive), exit of T14 (Raffles ave.), exit of T17, exit of T21 and S/F straight. The left-right-left at T7-9 might not be a DRS zone as the driving line goes from one side of the road to the other, but otherwise you can use it pretty much everywhere.