Client takes too much data

I have limited data of internet connection and last days i have a problem with lol taking so much of it. I've always played games that took about 20-30mb each, which is okay. But last few days it takes about 100 each games (the game itself takes still about 20mb but the problem is probably with loading the client... only the loading - including the first after logging it - takes approx 100mb, which i can't afford. Anybody know how to solve this? Thank u for any advices.
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