Scaling multi drop system

What should happen: I have a mining level of 5. Every mining level adds a 5% chance to drop an extra block. so my ods to get an extra drop with level 5 are 25%. When I am level 25 I always get a minimum of 2 blocks, and a 25% chance to gain another one, so it would be a tripple drop. Question: Can I make this system scaling infinitly? If yes, how? Do I use a loot_table for that, a predicate or smth else i dont know about yet? I tried soo long for that one, but i cant figure out how to do this. My problem is, that i cant scale a random chance with my scores. So i have to fix make a random chance like : 0.05 or 0.1. But it would be stupid to make hundreds of predicates for every possible 5%'s.