Now, people simply never reached that plateau where decline set in.

From the peak year of 1905, a steady decline set in.

However, during the late 1980s, a much more serious decline set in.

Although decline set in during the eighteenth century, glassmaking is still the island's main industry.

But by 1994, a serious decline had set in.

By late 1930, a steady decline in the world economy had set in, which did not reach bottom until 1933.

And once decline has set in, it is hard to reverse.

During his reign, the decline of the kingdom had set in.

On one of these he was taken ill, and a decline in his health set in.

By the mid-18th century decline had set in because of several economic factors.