What was the difference in interest income between dry bulk vessel operations and logistics business?
{"Revenue": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 254178, "Logistics Business for the Year Ended December 31, 2019": 228271, "Total for the Year Ended December 31, 2019": 482449}, "Administrative fee revenue from affiliates": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 16991, "Logistics Business for the Year Ended December 31, 2019": "\u2014", "Total for the Year Ended December 31, 2019": 16991}, "Interest income": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 9610, "Logistics Business for the Year Ended December 31, 2019": 1052, "Total for the Year Ended December 31, 2019": 10662}, "Interest expense and finance cost": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": -92948, "Logistics Business for the Year Ended December 31, 2019": -40531, "Total for the Year Ended December 31, 2019": -133479}, "Depreciation and amortization": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": -52288, "Logistics Business for the Year Ended December 31, 2019": -29435, "Total for the Year Ended December 31, 2019": -81723}, "Equity in net (losses)/earnings of affiliated companies": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": -9185, "Logistics Business for the Year Ended December 31, 2019": "\u2014", "Total for the Year Ended December 31, 2019": -9185}, "Net (loss)/ income attributable to Navios Holdings common -- stockholders": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": -212623, "Logistics Business for the Year Ended December 31, 2019": 20513, "Total for the Year Ended December 31, 2019": -192110}, "Net (loss)/ income attributable to Navios Holdings common -- Total assets": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 1511517, "Logistics Business for the Year Ended December 31, 2019": 631338, "Total for the Year Ended December 31, 2019": 2142855}, "Net (loss)/ income attributable to Navios Holdings common -- Goodwill": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 56240, "Logistics Business for the Year Ended December 31, 2019": 104096, "Total for the Year Ended December 31, 2019": 160336}, "Net (loss)/ income attributable to Navios Holdings common -- Capital expenditures": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": -36628, "Logistics Business for the Year Ended December 31, 2019": -7943, "Total for the Year Ended December 31, 2019": -44571}, "Net (loss)/ income attributable to Navios Holdings common -- Investment in affiliates": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 64352, "Logistics Business for the Year Ended December 31, 2019": "\u2014", "Total for the Year Ended December 31, 2019": 64352}, "Net (loss)/ income attributable to Navios Holdings common -- Cash and cash equivalents": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 32386, "Logistics Business for the Year Ended December 31, 2019": 45605, "Total for the Year Ended December 31, 2019": 77991}, "Net (loss)/ income attributable to Navios Holdings common -- Restricted cash": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 736, "Logistics Business for the Year Ended December 31, 2019": "\u2014", "Total for the Year Ended December 31, 2019": 736}, "Net (loss)/ income attributable to Navios Holdings common -- Long-term debt, net (including current and noncurrent portion)": {"Dry Bulk Vessel Operations for the Year Ended December 31, 2019": 1048318, "Logistics Business for the Year Ended December 31, 2019": 514929, "Total for the Year Ended December 31, 2019": 1563247}}
interest_dry_bulk = df["Interest income"]["Dry Bulk Vessel Operations for the Year Ended December 31, 2019"]
interest_logistics = df["Interest income"]["Logistics Business for the Year Ended December 31, 2019"]
answer = interest_dry_bulk - interest_logistics