What was the change in the Total acquisition and integration costs from 2017 to 2018?
{"": {"January 3, 2020": "", "December 28, 2018": "(in millions)", "December 29, 2017": ""}, "Acquisition costs": {"January 3, 2020": "$\u2014", "December 28, 2018": "$\u2014", "December 29, 2017": 25}, "Integration costs": {"January 3, 2020": 3, "December 28, 2018": 29, "December 29, 2017": 77}, "Total acquisition and integration costs": {"January 3, 2020": 3, "December 28, 2018": 29, "December 29, 2017": 102}}
integration_costs_2018 = df["Integration costs"]["December 28, 2018"]
total_acquisition_and_integration_costs_2017 = df["Total acquisition and integration costs"]["December 29, 2017"]
answer = integration_costs_2018 - total_acquisition_and_integration_costs_2017