Assertion: sparrow's population | /r/CapableOf | decline by about 31%
Facets:
value: slightly
type: DEGREE
value: between 1966
type: TEMPORAL
value: between 2014
type: TEMPORAL
Source sentences:
text: Conservation Brown-headed Cowbird are common across most of North America, although populations slightly declined by about 31% between 1966 and 2014, according to the North American Breeding Bird Survey.