That is the percentage of women arbitrators on the list of the Chamber of Commerce of Lima . I assume that the percentage of other lists is not much higher in Peru or other places in the world.
This is unfortunately this way because legal activity has historically been dominated by men, although we are not aware of it. I remember my surprise when I was doing a master's degree in legal sociology in the 90s, the framework in which I enrolled in a course called "feminist theory of law". I asked the professor the meaning of the subject, she rephrased: - how many women authors in legal theory have you read? ... I did not know how to give an answer.
This is a problem, because not only 16% of women participate in commercial relations and subsequent disputes. The population in Peru is more or less equal and currently almost all of us claim legal equality between genders. This should be represented in the proportion of women and men who litigate in arbitration cases and in the number of women and men in arbitration tribunals, but this is still not the case.
In my experience, I have unfortunately arbitrated with women collegues very rarely. Although I have tried to propose them as presidents, even before fellow woman arbitrator, usually the proposals have not opted this way.
What to do? The parties in dispute must have the radar on in this aspect, also the arbitration centers. It is up to the arbitrators, when it is in our power, to appoint presiding women arbitrators. This will raise the small percentage noted and that we benefit from the legal talent of more and more arbitrators in a growing professional market.
 See: https://www.camaralima.org.pe/principal/categoria/arbitros-nacionales/507/c-507 consulted 7/04/2018.