Chesapeake Bay- An unprecedented decline in submerged aquatic vegetation.

Beginning August 9 these same securities experienced a "sudden and unprecedented" decline in value, along with an increase in margin calls.

The widely expected downward revision was mainly a result of an "unprecedented" decline in manufacturing output, the government said.

But now some experts argue that an unprecedented economic decline may push down demand in the new Commonwealth of Independent States even more than supply falls.

There has also been an unprecedented decline for six straight months in the price of intermediate goods like parts and components.

Two years ago the company was telling of "an unprecedented decline" in sales.

Now it is witnessing a unprecedented decline in prices.

Given the unprecedented decline in new construction, however, more action is necessary.

The past fifty years have seen an unprecedented decline in wars and dictatorships.

The hitherto buoyant Taiwan stock exchange suffered an unprecedented decline during 1989 and in the first half of 1990.