A list from Forbes of countries who shut down the internet the most to silence dissent:
India (154 times, with Kashmir accounting for much of that)
Pakistan (19 times)
Iraq (8 times, Iraq is under US occupation)
Syria (8 times, where not shut down, bombed into silence)
Turkey (7 times)
D.R. Congo (5 times)
Ethiopia (5 times)
Iran (4 times)
Chad (3 times)
Egypt (3 times)