Dexаmethаsоne hаs been оrdered tо be given to your patient in preterm labor to aid in the development of her fetus' lungs. The health care provider has ordered Dexamethasone sodium phosphate 8 mgs IM. Dexamethasone sodium phosphate injection is supplied in 20 mg per 5 mLs. How many mL's would the nurse administer?