Researchers sought to determine the incidence of type 2 diabetes in women aged 60-75 years. The study participants were followed for three years with yearly assessments to determine whether they met the diagnostic criteria to be cases. At baseline, there were 2000 women and none of these had detectable type 2 diabetes. After one year, none had a diagnosis of the disease, and 100 had been lost to follow-up. After two years, 8 had a diagnosis of the disease and another 92 had been lost to follow-up. After three years, another 12 had a diagnosis of the disease, and 88 had been lost to follow-up. Calculate the incidence rate in person-years of type 2 diabetes in this group over the entire period of observation. You should assume that persons with a new diagnosis were disease-free for half the year, and those lost to follow-up were at risk for half the year