Demographics: bottom bars show different numbers

[dicortazar]

In some cases, the 0 years attraction/retention bars show different numbers. Those should be the same number. The same number of attracted developers remains in the first x months of analysis!.

Another discussion would be if we should directly remove those bottom bars, or at least the retention bar. The attraction bar makes sense given that this represents the total number of attracted developers for the first x months of analysis. However the retention bar does not provide useful information in this case.