I don't get your mean clearly, where is the "huge drop" in May/June 2015 for the youth set, I think just need to see the growth between May and Jun of the upper high diagram for this question.
Ok, I see what CG means - it is Natura, if you look at the top-right diagram.
But if you use the % variance by month, it seems to be Currus:
But percentages are not absolute units. Now I see that the questions says "most growth in total units", so I was reading the wrong chart.
Hope this helps others...
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