Getting individual test run data

When running load tests I see the consolodated output in the windows showing me min/max/average for the tests, but this display confuses me a little bit. For example I see that the min value goes up as well as down. How can this be? surely the min is the shortest time for that step and so should only go down?

I would like to see the raw test data, just the time taken for each step of each test run so I can do analysis myself of how the performance of the system changes under load. I don't seem to be able to get this data from anywhere, but I'm sure that I'm just missing something.

How can I get the raw data for individual tests runs in a load test?