Exactly how did you figure that out?
If you use your brain it's not that hard. I checked up how much one player would use, and that's 5 kB/s at mosts, then if you have 200 players you will have 1000 kB/s which is almost 10 mbit, if all players are using 5 kB/s which they are not all the time, so 3-4 mbit would fit good for 200 players.