I have a 2002 Mazda 626 with a recent coolant leaks. If I maximumly fill the tan

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I have a 2002 Mazda 626 with a recent coolant leaks. If I maximumly fill the tank with fresh coolant, the leak is very slow, probably 1/10 per week. If the coolant level is below the half level, the leak is very fast. What is the problem? Thanks.