What was the increase / (decrease) in Net income from 2018 to 2019?
{"($ in millions except per share amounts) -- For the year ended December 31:*": {"2019": 2019.0, "2018": 2018.0, "Yr.-to-Yr. Percent Change": "Yr.-to-Yr. Percent Change"}, "($ in millions except per share amounts) -- Net income as reported": {"2019": 9431.0, "2018": 8728.0, "Yr.-to-Yr. Percent Change": 8.1}, "($ in millions except per share amounts) -- Income/(loss) from discontinued operations, net of tax": {"2019": -4.0, "2018": 5.0, "Yr.-to-Yr. Percent Change": "NM"}, "($ in millions except per share amounts) -- Income from continuing operations": {"2019": 9435.0, "2018": 8723.0, "Yr.-to-Yr. Percent Change": 8.2}, "Non-operating adjustments (net of tax) -- Acquisition-related charges": {"2019": 1343.0, "2018": 649.0, "Yr.-to-Yr. Percent Change": 107.0}, "Non-operating adjustments (net of tax) -- Non-operating retirement-related costs/(income)": {"2019": 512.0, "2018": 1248.0, "Yr.-to-Yr. Percent Change": -58.9}, "Non-operating adjustments (net of tax) -- U.S. tax reform charge": {"2019": 146.0, "2018": 2037.0, "Yr.-to-Yr. Percent Change": -92.8}, "Non-operating adjustments (net of tax) -- Operating (non-GAAP) earnings": {"2019": 11436.0, "2018": 12657.0, "Yr.-to-Yr. Percent Change": -9.6}, "Non-operating adjustments (net of tax) -- Diluted operating (non-GAAP) earnings per share": {"2019": 12.81, "2018": 13.81, "Yr.-to-Yr. Percent Change": -7.2}}
net_income_2019 = df["($ in millions except per share amounts) -- Net income as reported"]["2019"]
net_income_2018 = df["($ in millions except per share amounts) -- Net income as reported"]["2018"]
answer = net_income_2019 - net_income_2018