Assertion: mercury's use | /r/CapableOf | drop to less than 5% of its level
Facets:
value: in 1988
type: TEMPORAL
value: by 1992
type: TEMPORAL
Source sentences:
text: By 1992, its use in batteries had dropped to less than 5% of its level in 1988, and overall use in electrical devices and light bulbs had dropped 50% in the same period.