How do I work this problem out please! I did not get the right answer.

QUESTION 12 A community health nurse conducted a study in collaboration with the local hospital to learn about the relationship between HIV and IV drug use in Paris, AR. Clients seen in the emergency room are identified as either IV drug users or non-IV drug users. These clients are then followed for one year. During that year, the research team identify 69 new cases of HIV out of 253 IV drug users, and 17 new cases of HIV out of 450 non-IV drug users. The community health nurse is interested in developing interventions to reduce the incidence of HIV and would like to target a prevention program addressing risk factors. What is the incidence rate of HIV in IV drug users per 1,000? (Round to the nearest whole number. Do not include units.)