ZP Crates Win Ratios

I have some questions about the win ratios on ZP crates, i've seen in other version of CF(Korean) the win rates are 1%, but i'm pretty sure that's the base win rate, not the actual, what i mean is, there's other things that can bring the win ratio up a little, like the achievement.. what other known factors exist? I mean, i can't win anything, and i recently spinned 93 crates of the very same weapon.. while others get a lot of stuff in few spins..

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