Percentile

MTrullàs 

Ok. That is different from what I had understood earlier.  See it all at work in the attached file:

NewMeasure = 
VAR total_ = CALCULATE ( COUNT ( Table1[Estancia Fábrica] ), ALL ( Table1 ) )
VAR currentEst_ = SELECTEDVALUE ( Table1[Estancia Fábrica], total_ )
VAR cumul_ =
    CALCULATE (
        COUNT ( Table1[Estancia Fábrica] ),
        Table1[Estancia Fábrica] <= currentEst_,
        ALL ( Table1 )
    )
RETURN
DIVIDE ( cumul_, total_ )