What was the change in the amount of Finished goods between 2018 and 2019?
{"Raw materials": {"2019": 577545, "2018": 579377}, "Work-in-process ": {"2019": 49315, "2018": 102337}, "Finished goods ": {"2019": 74078, "2018": 112632}, "Total inventories, net": {"2019": 700938, "2018": 794346}}
finished_goods_2019 = df["Finished goods "]["2019"]
finished_goods_2018 = df["Finished goods "]["2018"]
answer = finished_goods_2019 - finished_goods_2018