Technically, for scores at the top, never. But in 1985, back when the highest class was Independent Open, Erte and State Street won with 95.05s.
But scores are all very much relative to the eras in which they were produced. Skills are fast-evolving in this activity. And, as you are certainly aware, with the addition of "standard setting" Box 6 on the sheets, there's gonna be a bit of downward pressure at the top each new season. This year's 100 is next year's 98. That's just a logical outcome of the way the sheets are written.