Assertion: skylark's number | /r/CapableOf | decline by 33 per cent
Facets:
value: in the past 35 years
type: TEMPORAL
Source sentences:
text: In the past 35 years, numbers of tawny owls have declined by 33 per cent, lapwing by 40 per cent, skylark by 52 per cent and house sparrow by 64 per cent.