What is the change in Total operating expenses from fiscal year 2018 to fiscal year 2019?
{"Net revenues": {"2019": 100, "2018": 100}, "Cost of revenues": {"2019": 22, "2018": 21}, "Gross profit": {"2019": 78, "2018": 79}, "Operating expenses: -- Sales and marketing": {"2019": 32, "2018": 33}, "Operating expenses: -- Research and development": {"2019": 19, "2018": 20}, "Operating expenses: -- General and administrative": {"2019": 9, "2018": 12}, "Operating expenses: -- Amortization of intangible assets": {"2019": 4, "2018": 5}, "Operating expenses: -- Restructuring, transition and other costs": {"2019": 5, "2018": 8}, "Operating expenses: -- Total operating expenses": {"2019": 70, "2018": 78}, "Operating expenses: -- Operating income": {"2019": 8, "2018": 1}, "Operating expenses: -- Interest expense": {"2019": -4, "2018": -5}, "Operating expenses: -- Gain on divestiture": {"2019": "\u2014", "2018": 14}, "Operating expenses: -- Other expense, net": {"2019": -1, "2018": "\u2014"}, "Operating expenses: -- Income from continuing operations before income taxes": {"2019": 2, "2018": 9}, "Operating expenses: -- Income tax expense (benefit)": {"2019": 2, "2018": -14}, "Operating expenses: -- Income from continuing operations": {"2019": "\u2014", "2018": 23}, "Operating expenses: -- Income from discontinued operations, net of income taxes": {"2019": "\u2014", "2018": "\u2014"}, "Operating expenses: -- Net income": {"2019": 1, "2018": 24}}
total_operating_expenses_2019 = df["Operating expenses: -- Total operating expenses"]["2019"]
gross_profit_2019 = df["Gross profit"]["2019"]
answer = total_operating_expenses_2019 - gross_profit_2019