What is the percentage change in the total debt due within one year in 2019?
{"Notes payable(1)": {"NOTE": 26.0, "WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2019": 2.03, "2019": 1994.0, "2018": 3201.0}, "Loans secured by trade receivables": {"NOTE": 26.0, "WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2019": 2.71, "2019": 1050.0, "2018": 919.0}, "Long-term debt due within one year(2)": {"NOTE": 22.0, "WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2019": 4.77, "2019": 837.0, "2018": 525.0}, "Total debt due within one year": {"NOTE": "", "WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2019": "", "2019": 3881, "2018": 4645}}
total_debt_2019 = df["Total debt due within one year"]["2019"]
total_debt_2018 = df["Total debt due within one year"]["2018"]
answer = (total_debt_2019 - total_debt_2018) / total_debt_2018 * 100.0