What was the difference in the minimum revenue for logistics business between 2022 and 2023?
{"2020": {"Dry bulk vessels": 22266, "Logistics business": 129437}, "2021": {"Dry bulk vessels": 4607, "Logistics business": 97544}, "2022": {"Dry bulk vessels": 3445, "Logistics business": 75425}, "2023": {"Dry bulk vessels": "\u2014", "Logistics business": 69250}, "2024": {"Dry bulk vessels": "\u2014", "Logistics business": 60200}, "2025 and thereafter": {"Dry bulk vessels": "\u2014", "Logistics business": 642479}, "Total minimum revenue, net of commissions": {"Dry bulk vessels": 30318, "Logistics business": 1074335}}
revenue_2022 = df["2022"]["Logistics business"]
revenue_2023 = df["2023"]["Logistics business"]
answer = revenue_2022 - revenue_2023