Drop-down menu line chart showing the share of federal employees who are union members and the share who are covered by a union contract by quarter for 2023, 2024, and 2025. In 2025 (red), union membership rates decline from the first to the second quarter, rise in the third quarter, and fall again by the fourth quarter. Membership rates in 2023 and 2024 change more gradually, with modest declines early in the year followed by increases toward year-end. The figure highlights substantial intra-year swings in federal unionization during 2025.