What was the percentage change in the total earnings between 2018 and 2019?
{"U.S.": {"2019": 15103, "2018": 30815, "2017": 9315}, "Non-U.S.": {"2019": 35163, "2018": 27288, "2017": 30938}, "Total": {"2019": 50266, "2018": 58103, "2017": 40253}}
total_2019 = df["Total"]["2019"]
total_2018 = df["Total"]["2018"]
answer = ( total_2019 - total_2018 ) / total_2018 * 100.0