What was the percentage change in the Anti-dilutive shares excluded from the diluted earnings per share calculation in 2019 from 2018?
{"Basic: -- Weighted average common shares outstanding": {"2019": 41649, "2018": 42090, "2017": 41822}, "Diluted: -- Dilutive effect of stock appreciation rights, restricted stock, restricted stock units and shares held in rabbi trust": {"2019": 153, "2018": 156, "2017": 319}, "Diluted: -- Total weighted average diluted shares outstanding": {"2019": 41802, "2018": 42246, "2017": 42141}, "Diluted: -- Anti-dilutive shares excluded from the diluted earnings per share calculation": {"2019": 69, "2018": 44, "2017": 46}}
antidilutive_2019 = df["Diluted: -- Anti-dilutive shares excluded from the diluted earnings per share calculation"]["2019"]
antidilutive_2018 = df["Diluted: -- Anti-dilutive shares excluded from the diluted earnings per share calculation"]["2018"]
answer = (antidilutive_2019 - antidilutive_2018) / antidilutive_2018 * 100.0