What was the change in Accrued severance and related costs in 2019 from 2018?
{"Accrued compensation": {"2019": 38186, "2018": 34095}, "Accrued bonus and commissions": {"2019": 27039, "2018": 19835}, "Accrued vacation": {"2019": 20647, "2018": 19019}, "Accrued employment taxes": {"2019": 16468, "2018": 15598}, "Accrued severance and related costs (Note 5)": {"2019": 485, "2018": 793}, "Other": {"2019": 6766, "2018": 6473}, "": {"2019": 109591, "2018": 95813}}
accrued_severance_2019 = df["Accrued severance and related costs (Note 5)"]["2019"]
accrued_severance_2018 = df["Accrued severance and related costs (Note 5)"]["2018"]
answer = accrued_severance_2019 - accrued_severance_2018