What was the percentage change in current tax expense in Germany in 2019 from 2018?
{"Current tax expense -- Germany": {"2019": 625, "2018": 733, "2017": 935}, "Current tax expense -- Foreign": {"2019": 1153, "2018": 1019, "2017": 716}, "Current tax expense -- Total current tax expense": {"2019": 1778, "2018": 1752, "2017": 1651}, "Deferred tax expense/income -- Germany": {"2019": 3, "2018": 57, "2017": 584}, "Deferred tax expense/income -- Foreign": {"2019": 549, "2018": 298, "2017": 84}, "Deferred tax expense/income -- Total deferred tax income": {"2019": 552, "2018": 241, "2017": 668}, "Deferred tax expense/income -- Total income tax expense": {"2019": 1226, "2018": 1511, "2017": 983}}
tax_expense_2019 = df["Current tax expense -- Germany"]["2019"]
tax_expense_2018 = df["Current tax expense -- Germany"]["2018"]
answer = (tax_expense_2019 - tax_expense_2018) / tax_expense_2018 * 100.0