Assertion: copper sulfate's use | /r/CapableOf | decline to only 210 000 tonnes
Facets:
value: in 1990
type: TEMPORAL
value: from 980 000 tonnes
type: OTHER
Source sentences:
text: However, this process is being replaced to some extent by newer processes; use of Na 2 SO 4 in the US pulp industry declined from 980 000 tonnes in 1970 to only 210 000 tonnes in 1990.