What was the change in net income between 2018 and 2019?
{"Net income": {"2019": 67062, "2018": 68921, "2017": 5135}, "Other comprehensive income (loss): -- Foreign currency translation adjustments": {"2019": 1034, "2018": -15261, "2017": 16744}, "Other comprehensive income (loss): -- Total other comprehensive income (loss)": {"2019": 1034, "2018": -15261, "2017": 16744}, "Other comprehensive income (loss): -- Comprehensive income": {"2019": 68096, "2018": 53660, "2017": 21879}}
net_income_2019 = df["Net income"]["2019"]
net_income_2018 = df["Net income"]["2018"]
answer = net_income_2019 - net_income_2018