The data suggest that the underlying increase has accelerated since 1990.

Both trends seem to have accelerated since the 2000 census.

The rate of buildings leaving the program has accelerated since 2001, he said, as landlords find they can do better on the open market.

The problem affects estuaries throughout the country, he said, and has accelerated since the turn of the century.

Officials say the process of adding an honorary name to a street has accelerated since the Sept. 11 attack.

The pace of technological development has probably accelerated since 1980 more than in previous generations.

The pace of announced cutbacks has accelerated sharply since October to 2,600 each working day.

Both have been accelerated since the war by the widespread application of the internal combustion engine.

That process has been accelerated since the anthrax problem.

But trends that have accelerated since the early 1970's have brought much of the nation's urban prosperity to the South.