What was the change in the amount of U.S Tax Reform between 2018 and 2019?
{"Diluted earnings per share, as reported (GAAP)": {"2019": 3.5, "2018": 0.38}, "Restructuring costs, net of tax ": {"2019": 0.05, "2018": "\u2014"}, "U.S. Tax Reform ": {"2019": 0.23, "2018": 2.46}, "Accumulated foreign earnings assertion ": {"2019": -0.35, "2018": ""}, "One-time employee bonus, net of tax ": {"2019": "\u2014", "2018": 0.39}, "Diluted earnings per share, as adjusted (non-GAAP) (1)": {"2019": 3.43, "2018": 3.23}}
us_tax_reform_2019 = df["U.S. Tax Reform "]["2019"]
us_tax_reform_2018 = df["U.S. Tax Reform "]["2018"]
answer = us_tax_reform_2019 - us_tax_reform_2018