This activity peaked in the 19th and 20th centuries.

His activity peaked in 1851 and 52, ceasing sometime after 1867.

Overall, the activity of the H1N1 pandemic has peaked.

Those activities peaked around the period of the political collapse of the 1910s in Russia.

They offset their temporal activity patterns to be much less active during the day when human activity peaked.

The activity of roadracing karts peaked in the mid-1980s with some events reaching over 1000 entries at a national event.

In the late 70s and 80s, Humula's activity and population peaked when logging was the main industry in the area.

This activity, and the Jewish population peaked in the 1890s, and was halted by the Panic of 1893.

The Disposals Commission's activities peaked during 1946 and 1947.

Then the team showed that introducing other flies whose activity peaked at different times had disrupted the rhythms of the first group.