What was the percentage change in total income from continuing operations before income taxes between 2018 and 2019?
{"United States": {"2019": 1527.0, "2018": 1212.7, "2017": 971.2}, "Foreign": {"2019": 389.4, "2018": -58.1, "2017": 284.9}, "Total": {"2019": 1916.4, "2018": 1154.6, "2017": 1256.1}}
total_2019 = df["Total"]["2019"]
total_2018 = df["Total"]["2018"]
answer = ( total_2019 - total_2018 ) / total_2018 * 100.0