What was the change in the Net income from 2018 to 2019?
{"Numerator: -- Net Income (in millions)": {"April 27, 2019": 91.6, "April 28, 2018": 57.2, "April 29, 2017": 92.9}, "Denominator for Basic Earnings Per Share-Weighted Average Shares -- Outstanding and Vested/Unissued Restricted Stock Units": {"April 27, 2019": 37405298.0, "April 28, 2018": 37281630.0, "April 29, 2017": 37283096.0}, "Dilutive Potential Common Shares-Employee Stock Options, -- Restricted Stock Awards and Restricted Stock Units": {"April 27, 2019": 264262.0, "April 28, 2018": 260269.0, "April 29, 2017": 202605.0}, "Dilutive Potential Common Shares-Employee Stock Options, -- Denominator for Diluted Earnings Per Share": {"April 27, 2019": 37669560.0, "April 28, 2018": 37541899.0, "April 29, 2017": 37485701.0}, "Basic and Diluted Income Per Share: -- Basic Income Per Share": {"April 27, 2019": 2.45, "April 28, 2018": 1.54, "April 29, 2017": 2.49}, "Basic and Diluted Income Per Share: -- Diluted Income Per Share": {"April 27, 2019": 2.43, "April 28, 2018": 1.52, "April 29, 2017": 2.48}}
net_income_2019 = df["Numerator: -- Net Income (in millions)"]["April 27, 2019"]
net_income_2018 = df["Numerator: -- Net Income (in millions)"]["April 28, 2018"]
answer = net_income_2019 - net_income_2018