That always depends on the trip. Sometimes, it is just one person. However, if we have a number of matters to discuss, we send the appropriate number of people. We also often try to take advantage of a person being in a certain country by asking them to attend meetings that they would not normally attend. So we try to send the fewest number of people possible, while sending as many as are necessary to do the work properly.
On March 26th, 2009. See this statement in context.