SMS unsub/opt out benchmark

Hi All, 

We are trying to find a benchmark for SMS opt-out for mostly promotional SMSs ($ vouchers, % discounts, X weeks free and the like), the audience is a bit broad in terms of time on the database (but basically within the last 6 months) and are looking for a financial product (insurance, Credit card, loans etc)

I have done some research and some articles say unsub can be as high as 20% (for the first 30 days after a lead is created) and then I read others that said 2%, 5%...10%... anyway a bit all over the place.

Does anyone has some benchmarks or knowledge about this that can share?

Cheers 🤩