What is the difference between total net other operating (income) expenses in 2017 and 2019?
{"(Gain) loss on disposition of property, plant, and equipment": {"2019": 43, "2018": -96, "2017": -22}, "Restructure and asset impairments": {"2019": -29, "2018": 28, "2017": 18}, "Other": {"2019": 35, "2018": 11, "2017": 5}, "": {"2019": 49, "2018": -57, "2017": 1}}
total_2019 = df[""]["2019"]
total_2017 = df[""]["2017"]
answer = total_2019 - total_2017