That's a good question, and I think the answer is because unions are very organized groups that can push for more government protection. Other groups cannot organize with one voice to ask the government for more protection, in my view. For instance, unions are more organized and they have more of a centralized government than indigenous or other groups. They can push the government further on this issue.
With respect to the unionization rate, we do take that into account. We are studying whether one can explain the decrease in the unionization rates, which is very small--it's about 1% per year for the last seven years. It's not that unionization rates have gone down dramatically; they have gone down at the rate of 1% per year, which I agree is worrisome.
So far we haven't found any evidence supporting the view that violence is what is decreasing the unionization rate in Colombia. This is not yet in the document because we are just starting to write the second part of the project.