What is the change in Income from operations between 2019 and 2017?
{"Revenue": {"2019": 161216.0, "2018": 140326.0, "2017": 69879.0, "2019 % Change from 2018": 14.9, "2018 % Change from 2017": 100.8}, "Gross profit": {"2019": 104896.0, "2018": 100708.0, "2017": 43817.0, "2019 % Change from 2018": 4.2, "2018 % Change from 2017": 129.8}, "Gross margin %": {"2019": 65.1, "2018": 71.8, "2017": 62.7, "2019 % Change from 2018": "", "2018 % Change from 2017": ""}, "Income from operations": {"2019": 43996.0, "2018": 43641.0, "2017": 23816.0, "2019 % Change from 2018": 0.8, "2018 % Change from 2017": 83.2}, "Operating margin %": {"2019": 27.3, "2018": 31.1, "2017": 34.1, "2019 % Change from 2018": "", "2018 % Change from 2017": ""}}
income_from_operations_2019 = df["Income from operations"]["2019"]
income_from_operations_2017 = df["Income from operations"]["2017"]
answer = income_from_operations_2019 - income_from_operations_2017