What was the change in net cash from operating activities between 2018 and 2019?
{"Net cash provided by (used in): -- Operating activities": {"2019": 137649, "2018": 183932}, "Net cash provided by (used in): -- Investing activities": {"2019": -830481, "2018": -45360}, "Net cash provided by (used in): -- Financing activities": {"2019": 667223, "2018": -57704}}
net_cash_2018 = df["Net cash provided by (used in): -- Operating activities"]["2018"]
net_cash_2019 = df["Net cash provided by (used in): -- Operating activities"]["2019"]
answer = net_cash_2018 - net_cash_2019