What was the change in Cash at bank and in hand in 2019 from 2018?
{"": {"2019": "\u00a3m", "2018": "\u00a3m"}, "Sterling": {"2019": 5.8, "2018": 4.1}, "Euro": {"2019": 0.1, "2018": 0.2}, "Cash at bank and in hand": {"2019": 5.9, "2018": 4.3}}
cash_at_bank_and_in_hand_2019 = df["Cash at bank and in hand"]["2019"]
cash_at_bank_and_in_hand_2018 = df["Cash at bank and in hand"]["2018"]
answer = cash_at_bank_and_in_hand_2019 - cash_at_bank_and_in_hand_2018