# EU member states in 2025:
countries(group="EU", t=as.Date("2025-01-01"))
# check which of the following countries belong to euro area in 2025:
is.ea(id=c("HR","BG"), t=as.Date("2025-01-01"))
# check over time:
is.ea(id="BG", t=as.Date(c("2024-01-01","2025-01-01","2026-01-01")))
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