What was the percentage change in Prepayments in 2019 from 2018?
{"": {"2019": "\u00a3m", "(Restated) 2018": "\u00a3m"}, "Trade receivables": {"2019": 27.0, "(Restated) 2018": 28.8}, "Less: provision for impairment of trade receivables": {"2019": -2.1, "(Restated) 2018": -3.4}, "Net trade receivables": {"2019": 24.9, "(Restated) 2018": 25.4}, "Accrued income": {"2019": 28.0, "(Restated) 2018": 26.7}, "Prepayments": {"2019": 2.9, "(Restated) 2018": 2.7}, "Other receivables": {"2019": 0.3, "(Restated) 2018": 0.1}, "Total": {"2019": 56.1, "(Restated) 2018": 54.9}}
prepayments_2019 = df["Prepayments"]["2019"]
prepayments_2018 = df["Prepayments"]["(Restated) 2018"]
answer = (prepayments_2019 - prepayments_2018) / prepayments_2018 * 100.0