What is the change in accrued rent in 2019?
{"Accounts payable": {"2019": 1724, "2018": 1933}, "Other current liabilities: -- Accrued rent": {"2019": 75, "2018": 45}, "Other current liabilities: -- Legal contingencies": {"2019": 88, "2018": 30}, "Other current liabilities: -- Other": {"2019": 223, "2018": 282}, "Other current liabilities: -- Total other current liabilities": {"2019": 386, "2018": 357}}
accrued_rent_2019 = df["Other current liabilities: -- Accrued rent"]["2019"]
accrued_rent_2018 = df["Other current liabilities: -- Accrued rent"]["2018"]
answer = accrued_rent_2019 - accrued_rent_2018