What was the change in General and administration in 2018 from 2017?
{"Cost of cloud and software": {"2019": 138, "2018": 3, "2017": 55}, "Cost of services": {"2019": 154, "2018": 3, "2017": 118}, "Research and development": {"2019": 467, "2018": 3, "2017": 9}, "Sales and marketing": {"2019": 299, "2018": 11, "2017": 2}, "General and administration": {"2019": 71, "2018": 0, "2017": 2}, "Restructuring expenses": {"2019": 1130, "2018": 19, "2017": 182}}
general_and_administration_2018 = df["General and administration"]["2018"]
sales_and_marketing_2017 = df["Sales and marketing"]["2017"]
answer = general_and_administration_2018 - sales_and_marketing_2017