The Paediatric Task Force Report on Blood Pressure Control in Children reports blood pressure norms for children by age and sex group. Suppose in the population, it is known that the mean + standard deviation for 17 year old boys for diastolic blood pressure is 68.7+10.5 mm Hg. One approach for defining elevated diastolic blood pressure is to use 85 mm Hg - the standard for elevated diastolic blood pressure for children - as the cut off. What percentage of 17-year-old boys would have elevated blood pressure using this approach, given that the diastolic blood pressure of 17 year old boys follows normal distribution?