In the past decade an average of almost 400 events each year have met the U.N.criteria for a natural disaster.

VOA: standard.2009.10.14

Its venues are equally varied and the city hosts an average 130 music events each week, more than any other Scottish city.

UNESCO: Creative Cities

"A decade will, on average, include three events greater than magnitude 5, " the agency said.

CNN: Quake reported in eastern Canada

What is the average number of disciplinary events in each category?

FORBES: Investigating Brokerages (May 1, 2002 )