What was the change in total long-lived assets by geographical region between 2017 and 2018?
{"Long-lived assets* by geographic region: -- Americas": {"2019": 322, "2018": 203, "2017": 197}, "Long-lived assets* by geographic region: -- EMEA": {"2019": 142, "2018": 62, "2017": 75}, "Long-lived assets* by geographic region: -- Asia Pacific": {"2019": 21, "2018": 17, "2017": 22}, "Long-lived assets* by geographic region: -- Total long-lived assets by geographic region": {"2019": 485, "2018": 282, "2017": 294}}
total_longlived_assets_2018 = df["Long-lived assets* by geographic region: -- Total long-lived assets by geographic region"]["2018"]
total_longlived_assets_2017 = df["Long-lived assets* by geographic region: -- Total long-lived assets by geographic region"]["2017"]
answer = total_longlived_assets_2018 - total_longlived_assets_2017