A scuba diver dove from the surface of the ocean to an elevation of -99 9/10 feet at a rate of -26.6 feet per minute. After spending 13.25 minuets at that elevation the diver ascended to an elevation of -38 9/10 feet. The total time for the diver so far was 20 1/8 minutes. What was the rate of change in the divers elevation during the ascent? Round your answer to the nearest hundredth.