What is the change in the amount of Other in 2019 from 2018?
{"United States": {"2019": 956.6, "2018": 627.8, "2017": 522.8}, "United Kingdom": {"2019": 218.2, "2018": 240.7, "2017": 219.4}, "Australia": {"2019": 163.5, "2018": 166.7, "2017": 175.6}, "Far East/Middle East": {"2019": 74.0, "2018": 86.4, "2017": 112.7}, "Other": {"2019": 84.2, "2018": 81.3, "2017": 77.2}, "Total sales": {"2019": 1496.5, "2018": 1202.9, "2017": 1107.7}}
other_2019 = df["Other"]["2019"]
other_2018 = df["Other"]["2018"]
answer = other_2019 - other_2018