What is the difference in the 2020 U.S. and International plans?
{"2020": {"US Plans": 2295, "International Plans": 7055}, "2021": {"US Plans": 2333, "International Plans": 7197}, "2022": {"US Plans": 2353, "International Plans": 7337}, "2023": {"US Plans": 2371, "International Plans": 7624}, "2024": {"US Plans": 2388, "International Plans": 7624}, "2025-2029": {"US Plans": 11880, "International Plans": 40364}}
international_plans = df["2020"]["International Plans"]
us_plans = df["2020"]["US Plans"]
answer = international_plans - us_plans