What is the percentage of used lines of credit to Total available lines of credit as of December 31, 2019?
{"Used lines of credit (1)": {"2019": 98.9, "2018": 232.8}, "Unused lines of credit": {"2019": 1245.2, "2018": 1135.3}, "Total available lines of credit(2)": {"2019": 1344.1, "2018": 1368.1}}
used_lines_of_credit_2019 = df["Used lines of credit (1)"]["2019"]
total_available_lines_of_credit_2019 = df["Total available lines of credit(2)"]["2019"]
answer = used_lines_of_credit_2019 / total_available_lines_of_credit_2019 * 100.0