What percentage change is the number of employees in the Sales and Marketing department from 2019 to 2020?
{"Sales and Marketing": {"2020": 41, "2019": 38}, "Engineering": {"2020": 13, "2019": 9}, "Professional Services": {"2020": 6, "2019": 6}, "Customer Support": {"2020": 22, "2019": 22}, "Management and Administration": {"2020": 18, "2019": 17}, "Total": {"2020": 100, "2019": 92}}
sales_and_marketing_2020 = df["Sales and Marketing"]["2020"]
sales_and_marketing_2019 = df["Sales and Marketing"]["2019"]
answer = ( sales_and_marketing_2020 - sales_and_marketing_2019 ) / sales_and_marketing_2019 * 100.0