Divide Column By Column

Anonymous Create a measure to count bar marks per slice:

BarMarksPerSlice = COUNTROWS('YourTable')

Create a measure to count slices in a segment:

SlicesInSegment = CALCULATE(
DISTINCTCOUNT('YourTable'[SliceColumn]),
ALLEXCEPT('YourTable', 'YourTable'[SegmentColumn])
)

Create a measure to divide the count of bar marks per slice by the count of slices in a segment:

Result = DIVIDE([BarMarksPerSlice], [SlicesInSegment])