What was the difference in customer relationships, trade names, patents, and user lists, at cost from 2018 to 2019?
{"Developed technologies, at cost": {"2019": 670.2, "2018": 578.5}, "Customer relationships, trade names, patents, and user lists, at cost (1)": {"2019": 533.1, "2018": 372.5}, "Other intangible assets, at cost (2)": {"2019": 1203.3, "2018": 951.0}, "Less: accumulated amortization": {"2019": -922.5, "2018": -895.8}, "Other intangible assets, net": {"2019": 280.8, "2018": 55.2}}
customer_relationships_trade_names_patents_and_user_lists_at_cost_1_2019 = df["Customer relationships, trade names, patents, and user lists, at cost (1)"]["2019"]
customer_relationships_trade_names_patents_and_user_lists_at_cost_1_2018 = df["Customer relationships, trade names, patents, and user lists, at cost (1)"]["2018"]
answer = customer_relationships_trade_names_patents_and_user_lists_at_cost_1_2019 - customer_relationships_trade_names_patents_and_user_lists_at_cost_1_2018