What was the percentage change in Income tax benefit (provision) between 2018 and 2019?
{"Current: -- Federal": {"2019": -1.7, "2018": -1.4, "2017": -0.1}, "Current: -- State": {"2019": -5.0, "2018": -1.8, "2017": -3.8}, "Current: -- Foreign": {"2019": -48.2, "2018": -189.7, "2017": -113.4}, "Deferred: -- Federal": {"2019": 1.4, "2018": 4.0, "2017": 0.2}, "Deferred: -- State": {"2019": 0.5, "2018": 0.7, "2017": 1.0}, "Deferred: -- Foreign": {"2019": 53.2, "2018": 298.3, "2017": 85.4}, "Deferred: -- Income tax benefit (provision)": {"2019": 0.2, "2018": 110.1, "2017": -30.7}}
income_tax_benefit_provision_2019 = df["Deferred: -- Income tax benefit (provision)"]["2019"]
income_tax_benefit_provision_2018 = df["Deferred: -- Income tax benefit (provision)"]["2018"]
answer = ( income_tax_benefit_provision_2019 - income_tax_benefit_provision_2018 ) / income_tax_benefit_provision_2018 * 100.0