What was the change in assets from various other countries between 2017 and 2018?
{"United States": {"2019": 521.1, "2018": 393.3, "2017": 388.5}, "Thailand": {"2019": 209.3, "2018": 215.5, "2017": 178.0}, "Various other countries": {"2019": 266.3, "2018": 159.1, "2017": 116.8}, "Total long-lived assets": {"2019": 996.7, "2018": 767.9, "2017": 683.3}}
various_other_countries_2018 = df["Various other countries"]["2018"]
various_other_countries_2017 = df["Various other countries"]["2017"]
answer = various_other_countries_2018 - various_other_countries_2017