What was the percentage change in the net income between 2018 and 2019?
{"Net revenues": {"April 26, 2019": 6146.0, "April 27, 2018": 5919.0, "April 28, 2017": 5491.0}, "Gross profit": {"April 26, 2019": 3945.0, "April 27, 2018": 3709.0, "April 28, 2017": 3364.0}, "Gross profit margin percentage": {"April 26, 2019": 64.0, "April 27, 2018": 63.0, "April 28, 2017": 61.0}, "Income from operations": {"April 26, 2019": 1221.0, "April 27, 2018": 1158.0, "April 28, 2017": 621.0}, "Income from operations as a percentage of net revenues": {"April 26, 2019": 20.0, "April 27, 2018": 20.0, "April 28, 2017": 11.0}, "Provision for income taxes": {"April 26, 2019": 99.0, "April 27, 2018": 1083.0, "April 28, 2017": 140.0}, "Net income": {"April 26, 2019": 1169.0, "April 27, 2018": 116.0, "April 28, 2017": 481.0}, "Diluted net income per share": {"April 26, 2019": 4.51, "April 27, 2018": 0.42, "April 28, 2017": 1.71}, "Operating cash flows": {"April 26, 2019": 1341.0, "April 27, 2018": 1478.0, "April 28, 2017": 986.0}}
net_income_2019 = df["Net income"]["April 26, 2019"]
net_income_2018 = df["Net income"]["April 27, 2018"]
answer = (net_income_2019 - net_income_2018) / net_income_2018 * 100.0