From the CDC Morbidity and Mortality Weekly Report, October 7, 2016
Among all the dates, DE ranks 3rd for MMR, DTaP and 2 doses of MMR. And 12th for non-medical exemptions. See articles below.
Vaccination Coverage Among Children in Kindergarten — United States, 2015–16 School Year
Vaccination Coverage Among Children Aged 19–35 Months — United States, 2015