What was the increase / (decrease) in the cash flow from operating activities from 2018 to 2019?
{"Cash flows provided by (used in): -- Operating activities": {"2019": 339096, "2018": 357321, "2017": 210027}, "Cash flows provided by (used in): -- Investing activities": {"2019": -217819, "2018": -221459, "2017": -1042711}, "Cash flows provided by (used in): -- Financing activities": {"2019": -118481, "2018": -141920, "2017": 821264}, "Cash flows provided by (used in): -- Increase (decrease) in cash and cash equivalents": {"2019": 2796, "2018": -6058, "2017": -11420}}
cash_flow_2019 = df["Cash flows provided by (used in): -- Operating activities"]["2019"]
cash_flow_2018 = df["Cash flows provided by (used in): -- Operating activities"]["2018"]
answer = cash_flow_2019 - cash_flow_2018