Add extra answer to explicit results of different answers

The total number of authors with 5 participations is smaller,
when counting by institution, then the same count in general.

This is because the count by institution only counts participations
of this author for this institution (a relevant choice), which is
often the same but may be less than the total number of participations
of the author in general.
Compute percentage of participations for Institutions and Countries

The percentage is relative to the total of authors in any given
institution/country with a number of AR participations in the same
range.