What was the change in the total financial expenses in 2019 from 2018?
{"Interest expenses:": {"2019": "-", "2018": "-", "2017": "-"}, "Financial expenses arising from lease liabilities regarding right-of-use assets": {"2019": 2.4, "2018": 2.3, "2017": 1.8}, "Other financial expenses": {"2019": 39.5, "2018": 37.0, "2017": 38.8}, "Total": {"2019": 41.9, "2018": 39.3, "2017": 40.6}}
total_2019 = df["Total"]["2019"]
total_2018 = df["Total"]["2018"]
answer = total_2019 - total_2018