What is the change in the value of customer relationships between 2018 and 2019?
{"Recipes": {"2019": 44, "2018": 44}, "Customer lists and other customer related intangibles": {"2019": 4529, "2018": 4529}, "Customer relationships": {"2019": 985, "2018": 985}, "Trade names": {"2019": 2248, "2018": 2248}, "Formula": {"2019": 438, "2018": 438}, "": {"2019": 8244, "2018": 8244}, "Accumulated amortization": {"2019": -8092, "2018": -7900}, "Intangible assets, net": {"2019": 152, "2018": 344}}
customer_relationship_2019 = df["Customer relationships"]["2019"]
customer_relationship_2018 = df["Customer relationships"]["2018"]
answer = customer_relationship_2019 - customer_relationship_2018