What was the change in the increase resulting from permanent differences between 2017 and 2018?
{"Federal statutory income tax rate": {"2019": 21.0, "2018": 24.5, "2017": 35.0}, "Increase (decrease) resulting from:       -- Foreign tax rate differences": {"2019": -21.0, "2018": -30.2, "2017": -39.9}, "Increase (decrease) resulting from:       -- Withholding tax on dividends ": {"2019": -5.4, "2018": 23.7, "2017": "\u2014"}, "Increase (decrease) resulting from:       -- Permanent differences ": {"2019": -1.3, "2018": 0.8, "2017": 3.0}, "Increase (decrease) resulting from:       -- Excess tax benefits related to share-based compensation ": {"2019": -1.3, "2018": -2.7, "2017": -2.0}, "Increase (decrease) resulting from:       -- Global intangible low-taxed income (\"GILTI\") ": {"2019": 11.7, "2018": "\u2014", "2017": "\u2014"}, "Increase (decrease) resulting from:       -- Deemed repatriation tax ": {"2019": 5.6, "2018": 92.2, "2017": "\u2014"}, "Increase (decrease) resulting from:       -- Non-deductible compensation": {"2019": 1.5, "2018": 0.2, "2017": 0.2}, "Increase (decrease) resulting from:       -- Valuation allowances ": {"2019": 1.5, "2018": -30.6, "2017": 12.2}, "Increase (decrease) resulting from:       -- Rate changes ": {"2019": "\u2014", "2018": 9.0, "2017": "\u2014"}, "Increase (decrease) resulting from:       -- Other, net ": {"2019": 1.5, "2018": 1.0, "2017": -0.5}, "Increase (decrease) resulting from:       -- Effective income tax rate": {"2019": 13.8, "2018": 87.9, "2017": 8.0}}
increase_decrease_resulting_from_permanent_differences_2018 = df["Increase (decrease) resulting from:       -- Permanent differences "]["2018"]
increase_decrease_resulting_from_permanent_differences_2017 = df["Increase (decrease) resulting from:       -- Permanent differences "]["2017"]
answer = increase_decrease_resulting_from_permanent_differences_2018 - increase_decrease_resulting_from_permanent_differences_2017