The layout of legend in Visualization

I got the following legend in the right-side based on buckets order of the left-size, which is first by timestamp (30 minutes) and then by the number of flights (top 5).
I know that for each interval (30 minutes), top 5 destination countries (by number of flights) are shown in the legend. But I don't know how "Descending" correspond to the countries shown in the legend? Or in other word, which one should be on the top of the curve and which one should be in the bottom (in vertical axis)? Is there any rule for layout of the countries shown?

You should move this to the kibana forum.

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