You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 8 percent, -12 percent, 23 percent, 38 percent, and 13 percent. Suppose the average inflation rate over this period was 3.78 percent and the average T-bill rate over the period was 4.69 percent. What was the average real risk premium over this time period? (don't round calculations)