What was the % change in net income available for common shareholders from 2018 to 2019?
{"(In millions, except earnings per share) -- Year Ended June 30,": {"2019": 2019.0, "2018": 2018.0, "2017": 2017.0}, "(In millions, except earnings per share) -- Net income available for common shareholders (A)": {"2019": 39240.0, "2018": 16571.0, "2017": 25489.0}, "(In millions, except earnings per share) -- Weighted average outstanding shares of common stock (B)": {"2019": 7673.0, "2018": 7700.0, "2017": 7746.0}, "(In millions, except earnings per share) -- Dilutive effect of stock-based awards": {"2019": 80.0, "2018": 94.0, "2017": 86.0}, "(In millions, except earnings per share) -- Common stock and common stock equivalents (C)": {"2019": 7753.0, "2018": 7794.0, "2017": 7832.0}, "Earnings Per Share -- Basic (A/B)": {"2019": 5.11, "2018": 2.15, "2017": 3.29}, "Earnings Per Share -- Diluted (A/C)": {"2019": 5.06, "2018": 2.13, "2017": 3.25}}
net_income_2019 = df["(In millions, except earnings per share) -- Net income available for common shareholders (A)"]["2019"]
net_income_2018 = df["(In millions, except earnings per share) -- Net income available for common shareholders (A)"]["2018"]
answer = (net_income_2019 - net_income_2018) / net_income_2018 * 100.0