What was the percentage change in invested capital in 2019 from 2018?
{"Tangible and intangible fixed assets": {"2019": 1782.2, "2018": 1445.0, "2017": 1384.8}, "Investments in joint ventures": {"2019": 1.2, "2018": 0.1, "2017": 0.3}, "Bunkers": {"2019": 34.8, "2018": 39.4, "2017": 33.2}, "Accounts receivables ": {"2019": 99.5, "2018": 96.3, "2017": 87.5}, "Assets held-for-sale": {"2019": 9.1, "2018": 6.2, "2017": 6.6}, "Deferred tax liability": {"2019": -44.9, "2018": -44.9, "2017": -44.9}, "Trade payables ": {"2019": -94.4, "2018": -71.6, "2017": -60.0}, "Current tax liabilities": {"2019": -1.5, "2018": -1.0, "2017": -1.4}, "Deferred income": {"2019": "-", "2018": -0.1, "2017": -0.1}, "Invested capital": {"2019": 1786.0, "2018": 1469.4, "2017": 1406.0}}
invested_capital_2019 = df["Invested capital"]["2019"]
invested_capital_2018 = df["Invested capital"]["2018"]
answer = ( invested_capital_2019 - invested_capital_2018 ) / invested_capital_2018 * 100.0