Generally after about 1979 the Soviet Union knew that the west could hear the submarines long before the Russians would ever get in range, its why the period saw a complete shift to the Bastion concept, what you also find is come the 1980's the Echos were hopelessly outdated the missile they carried SS-N-3c Shaddock was also obsolete the Russians simply welded up and covered the missile hatches turning the submarine into a SSN.
In 1985 the scrapping of the Echos started first in the pacific with only 2 remaining by the end of that year, what you also should know is that come the 1980's the older submarines mainly of the 1st generation Hotel Echo Novembers rarely went to sea, they were kept in a sort of secondary reserve but just there to bulk up the numbers.
1984 would have been about right to see the withdrawal from heavy active duty for these submarines, bear in mind 1991 saw the mass decommission of nearly all these units.
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