Could you tell me how many landings are exclusively driven by Integrated Standby Instrument System or equivalent in the world per year ?
Same question with "partially" using instead of "exclusively".
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None, as far as I have ever heard of. There may be an instance out there of failure of both/all of the INS’s or displays, but in the airline world at least, it would have to be absurdly uncommon.
It is nice to have the standby ADI as a tie-breaker between the two primary displays in case they should happen to disagree (which was more likely with mechanical instruments than with electronic displays), but actually losing everything else & using just the standby to landing - between really rare and unheard of.