What is the change in the adjusted net income between 2018 and 2019?
{"Numerator: -- Net income": {"December 27, 2019 ": 24193, "December 28, 2018 ": 20402, "December 29, 2017": 14366}, "Add effect of dilutive securities -- Interest on convertible notes, net of tax": {"December 27, 2019 ": 207, "December 28, 2018 ": 362, "December 29, 2017": 536}, "Add effect of dilutive securities -- Adjusted net income": {"December 27, 2019 ": 24400, "December 28, 2018 ": 20764, "December 29, 2017": 14902}, "Denominator: -- Weighted average basic common shares outstanding": {"December 27, 2019 ": 29532342, "December 28, 2018 ": 28703265, "December 29, 2017": 26118482}, "Denominator: -- Dilutive effect of stock options and unvested common shares": {"December 27, 2019 ": 211050, "December 28, 2018 ": 270520, "December 29, 2017": 68670}, "Denominator: -- Dilutive effect of convertible notes": {"December 27, 2019 ": 329946, "December 28, 2018 ": 705134, "December 29, 2017": 1237374}, "Denominator: -- Weighted average diluted common shares outstanding": {"December 27, 2019 ": 30073338, "December 28, 2018 ": 29678919, "December 29, 2017": 27424526}}
adjusted_net_income_2019 = df["Add effect of dilutive securities -- Adjusted net income"]["December 27, 2019 "]
adjusted_net_income_2018 = df["Add effect of dilutive securities -- Adjusted net income"]["December 28, 2018 "]
answer = adjusted_net_income_2019 - adjusted_net_income_2018