What was the percentage change in the profit attributable to equity shareholders from 2018 to 2019?
{"Profit attributable to equity shareholders (m)": {"2019": 166.6, "2018": 223.1}, "Weighted average shares (million)": {"2019": 73.7, "2018": 73.6}, "Dilution (million)": {"2019": 0.2, "2018": 0.2}, "Diluted weighted average shares (million)": {"2019": 73.9, "2018": 73.8}, "Basic earnings per share": {"2019": 226.2, "2018": 303.1}, "Diluted earnings per share": {"2019": 225.5, "2018": 302.0}}
profit_2019 = df["Profit attributable to equity shareholders (m)"]["2019"]
profit_2018 = df["Profit attributable to equity shareholders (m)"]["2018"]
answer = (profit_2019 - profit_2018) / profit_2018 * 100.0