By how much less was the provision for income taxes in 2019 compared to 2018?
{"Provision for income taxes": {"2019": 1185.0, "Actual": -87.0, "Constant": -86.0, "2018": 8837.0}, "Effective tax rate": {"2019": 9.7, "Actual": "", "Constant": "", "2018": 71.1}}
provision_2018 = df["Provision for income taxes"]["2018"]
provision_2019 = df["Provision for income taxes"]["2019"]
answer = provision_2018 - provision_2019