I don't know full history but VUSXX for 2022 - 100%, 2023 - 80%, 2024 - 100%. For both VMFXX and VMRXX seems they didn't qualify in 2022/3 but did in 2024.
https://personal1.vanguard.com/pdf/USGOIN_2023.pdf
https://investor.vanguard.com/content/dam/retail/publicsite/en/documents/taxes/usgoin-2024.pdf
https://investor.vanguard.com/content/dam/retail/publicsite/en/documents/taxes/USGO_012025.pdf
