What is the percentage constitution of the cost of customer relationships among the total cost of the total intangible assets in 2019?
{"Completed technologies": {"Weighted Average Amortization Period": 6.4, "Cost": 20341.0, "Accumulated Amortization": 7104.0, "Net": 13237.0}, "Customer relationships": {"Weighted Average Amortization Period": 4.8, "Cost": 17628.0, "Accumulated Amortization": 6701.0, "Net": 10927.0}, "Trade names": {"Weighted Average Amortization Period": 4.5, "Cost": 618.0, "Accumulated Amortization": 377.0, "Net": 241.0}, "Total intangible assets": {"Weighted Average Amortization Period": "", "Cost": 38587, "Accumulated Amortization": 14182, "Net": 24405}}
customer_relationships_cost = df["Customer relationships"]["Cost"]
total_intangible_assets_cost = df["Total intangible assets"]["Cost"]
answer = customer_relationships_cost / total_intangible_assets_cost * 100.0