Assertion: tern's population | /r/CapableOf | drop by more than 50%
Facets:
value: to 2003
type: TEMPORAL
value: from the mid-1980s
type: TEMPORAL
Source sentences:
text: The populations wintering in South America dropped by more than 50% from the mid-1980s to 2003 and the rufa subspecies is listed as federally Threatened in the United States.