What was the change in the Dividends per share declared between 2018 and 2019?
{"Dividends per share declared": {"April 26, 2019": 1.6, "April 27, 2018": 0.8, "April 28, 2017": 0.76}, "Dividend payments allocated to additional paid-in capital": {"April 26, 2019": 403.0, "April 27, 2018": 106.0, "April 28, 2017": 88.0}, "Dividend payments allocated to retained earnings (accumulated deficit)": {"April 26, 2019": "$ \u2014", "April 27, 2018": 108.0, "April 28, 2017": 120.0}}
dividends_per_share_declared_april_26_2019 = df["Dividends per share declared"]["April 26, 2019"]
dividends_per_share_declared_april_27_2018 = df["Dividends per share declared"]["April 27, 2018"]
answer = dividends_per_share_declared_april_26_2019 - dividends_per_share_declared_april_27_2018