A 5-year prospective cohort study was conducted to assess the association between cigarette smoking and reduced lung function among 2,561 individuals at-risk. Of these, 493 were followed for 1 year, 562 were followed for 2 years, 437 were followed for 3 years, 622 were followed for 4 years, and 447 were followed for 5 years. By the end of the study, 351 participants had been diagnosed with reduced lung function during the 5-year period. Calculate the incidence density rate per 1,000 person-years. Please give your answer rounded to the 10^th decimal place.