What was the change in adjusted operating profit?
{"": {"2019": "$ million", "2018": "$ million", "Per cent": "change"}, "Employee remuneration costs1": {"2019": 220.5, "2018": 208.9, "Per cent": 5.6}, "Distributions to shareholders2": {"2019": 28.6, "2018": 54.8, "Per cent": -47.8}, "Adjusted operating profit3": {"2019": 92.9, "2018": 77.1, "Per cent": 20.5}}
adjusted_operating_profit_2019 = df["Adjusted operating profit3"]["2019"]
adjusted_operating_profit_2018 = df["Adjusted operating profit3"]["2018"]
answer = adjusted_operating_profit_2019 - adjusted_operating_profit_2018