Is your cycle length the exact same every month?

I was curious to add up my exact average cycle length and when I saw my cycle lengths from the last 12 months I wondered if everyones is a little different like this or if more women's are closer to the same number of days every month. These were mine from the last 12 months making my average 27 days

26

25

30

27

27

28

28

31

25

30

27

29

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