The phrase "increased an average of" is correct and can be used in written English.
One example of its usage is, "Employee satisfaction has increased an average of 10% since last year."
The report from Dynamic Logic found, according to Forbes.com, that among visitors to the Web site exposed to the ads, association of the message with the brands increased an average of 28percentt, purchase consideration increased an average of 14percentt, awareness of the brands increased an average of 11percentt and favorable impressions of the brands increased an average of 6percentt.
In five years, Mountaineer's sales have increased an average of 43percentt and earnings 54percentt.
From 1970 to 2008, Medicare spending per beneficiary increased an average of 9percentt annually.
Their payments increased an average of 6percenttoto a monthly total of about $75.
From 2004 to 2008, A.S.C.'s revenue increased an average of forty-six per cent each year.
Its reverse mortgage loans have increased an average of 50percentt a year in recent years, according to Mrs. White.
Yields increased an average of 20%, corresponding to greater plant biomass and more carbon returned to the soils.
At the same time, life expectancy increased an average of 0.84 years.
From 1995 to 2005, labor productivity increased an average of 2.5percentt a year, reports the Bureau of Labor Statistics.
Over 2 years, lumbar spine bone mineral density measurements increased an average of 10%.
According to the commission, local property taxes have increased an average of 7percentt a year for the last four years.
