1.   An unprecedented number of cars entered the race.

2.   Farmers are leaving the land in unprecedented numbers.

3.   So they are quitting, along with breeders, in unprecedented numbers.

4.   The explosion of extreme sports in recent years has produced an unprecedented number of ultra-endurance races.

5.   The war in turn stimulated an unprecedented number of new nationalisms.

6.   An unprecedented number of students are taking the class.

7.   The scandal had already caused the closure of the bank and had contributed to an unprecedented number of incumbent legislators retiring or suffering electoral defeats.

8.   There were an unprecedented number of vacancies following the Revolution, and many of the new appointments went to Low Churchmen who tended to be Whig in sympathy.

9.   Along the crest of the Appalachians, red spruce trees are dying in unprecedented numbers.

10.   Amid an unprecedented number of executions by Texas, no one knows better than Brazzil that not every condemned man wants to live.