What is the percentage change in ingredients between 2018 and 2019?
{"Ingredients": {"2019": 1942, "2018": 1580}, "Packaging": {"2019": 2230, "2018": 2072}, "Finished goods": {"2019": 2220, "2018": 2165}, "Total inventories, net": {"2019": 6392, "2018": 5817}}
ingredients_2019 = df["Ingredients"]["2019"]
ingredients_2018 = df["Ingredients"]["2018"]
answer = ( ingredients_2019 - ingredients_2018 ) / ingredients_2018 * 100.0