Assertion: bison's number | /r/CapableOf | decline in late 1960s
Facets:
value: to 2,200 bison
type: OTHER
value: due to this process
type: CAUSE
value: by the late 1990s
type: TEMPORAL
Source sentences:
text: In the case of Wood Buffalo National Park, the number of wood bison declined from 10,000 bison in the late 1960s to 2,200 bison by the late 1990s due to this process.