A group of ten older adults are followed for one calendar year (January 1 - December 31) to see if they develop colon cancer. All individuals are disease-free at the beginning of the study. Study data are reported below. Participant 1 Participant 2 Participant 3 Participant 4 Participant 5 Participant 6 Participant 7 Participant 8 Participant 9 Participant 10 Developed colon cancer on July 31 Did not develop colon cancer during the study Did not develop colon cancer during the study Moved and was lost to follow-up on August 31 Did not develop colon cancer during the study Developed colon cancer on December 31 Died in a motor vehicle collision on January 31 Died of lung cancer on October 31 Did not develop colon cancer during the study Did not develop colon cancer during the study What is the incidence rate of colon cancer in this study? Report your answer as "per 12 person-months" and round to 2 decimal places.