DAX Minimum of a count within a Group

I have a dataset with dates and hours and a count of the number of events within each hour. I want a measure to take the minimum value of the count within each hour.

So the min count by hour column at hour 0 in the above example would show 1 and at hour 1 it would show 2 etc.

I have tried the following DAX but it just shows the same value as the count.

Min count by hour = var _table = 
SUMMARIZE('Arrivals Predictions', 'Arrivals Predictions'[Hour], "count", COUNT('Arrivals Predictions'[AE_AttendNo]))
return
MINX(_table, [count])

Thanks in advance