What was the change in Total income tax charge in 2019 from 2018?
{"": {"Year-ended 31 March 2019": "$M", "Year-ended 31 March 2018 Restated See note 2": "$M"}, "Current income tax: -- UK corporation tax": {"Year-ended 31 March 2019": 1.3, "Year-ended 31 March 2018 Restated See note 2": 1.2}, "Current income tax: -- Adjustments in respect of previous years UK tax": {"Year-ended 31 March 2019": 0.3, "Year-ended 31 March 2018 Restated See note 2": 0.3}, "Current income tax: -- Overseas tax before exceptional items": {"Year-ended 31 March 2019": 22.2, "Year-ended 31 March 2018 Restated See note 2": 23.0}, "Current income tax: -- Adjustment in respect of previous years": {"Year-ended 31 March 2019": 13.1, "Year-ended 31 March 2018 Restated See note 2": 10.2}, "Current income tax: -- Total current tax charge": {"Year-ended 31 March 2019": 36.9, "Year-ended 31 March 2018 Restated See note 2": 34.7}, "Deferred tax: -- Origination and reversal of temporary differences": {"Year-ended 31 March 2019": 2.5, "Year-ended 31 March 2018 Restated See note 2": -16.7}, "Deferred tax: -- Impact of changes in US tax rate": {"Year-ended 31 March 2019": "-", "Year-ended 31 March 2018 Restated See note 2": 5.4}, "Deferred tax: -- Adjustment in respect of previous years": {"Year-ended 31 March 2019": -12.7, "Year-ended 31 March 2018 Restated See note 2": -3.5}, "Deferred tax: -- Total deferred tax credit": {"Year-ended 31 March 2019": -10.2, "Year-ended 31 March 2018 Restated See note 2": -14.8}, "Deferred tax: -- Total income tax charge": {"Year-ended 31 March 2019": 26.7, "Year-ended 31 March 2018 Restated See note 2": 19.9}}
total_income_tax_charge_2019 = df["Deferred tax: -- Total income tax charge"]["Year-ended 31 March 2019"]
total_income_tax_charge_2018 = df["Deferred tax: -- Total income tax charge"]["Year-ended 31 March 2018 Restated See note 2"]
answer = total_income_tax_charge_2019 - total_income_tax_charge_2018