What was the change in Cash flows from operating activities between 2017 and 2018?
{"Cash flows from operating activities": {"2019": 47112, "2018": 60710, "2017": 57187}, "Cash flows used in investing activities": {"2019": -73414, "2018": -13377, "2017": -168795}, "Cash flows (used in) / from financing activities": {"2019": -130, "2018": 2399, "2017": 67303}}
cash_flows_from_operating_activities_2018 = df["Cash flows from operating activities"]["2018"]
cash_flows_from_operating_activities_2017 = df["Cash flows from operating activities"]["2017"]
answer = cash_flows_from_operating_activities_2018 - cash_flows_from_operating_activities_2017