2014 was a strong year for the auto industry as a whole, and a new study has found that it was a solid period for individual dealerships as well.

The average number of new-vehicle sales at dealerships in the United States has risen for three years in a row now, with 2014 marking a record 921-unit average per store, Automotive News reported via a study from the consulting firm Urban Science.

While the sales average jumped by 50 units, the number of dealers in the country barely increased year over year, rising 0.6 percent to 17,953 dealerships.

"The average number of sales was based on total vehicle sales of 16.5 million at 17,953 dealerships last year," Automotive News reported. "It's an increase from 874 units on average sold per store in 2013, based on annual sales of 15.6 million units sold at 17,838 stores."

Detroit-based Urban Science predicts that auto sales will continue to grow this year.

"Sales throughput for dealers has achieved another record level due to a great sales year and a stable dealer count. This is the third year in a row that this record has been broken," Mitch Phillips, global director at Urban Science, said in a statement.

"2015 looks promising. With a stable dealer count, as we have seen over the past several years, and the strong sales forecast which the industry is now predicting, we could see this record broken again."

IHS Automotive recently predicted that auto sales worldwide will hit 88.6 million this year. North American sales are expected to grow by 2.5 percent to 20 million units, while the U.S. market could hit 16.9 million in light-vehicle sales.

But it's not all good news. IHS expects auto sales will slow down compared with the rapid growth seen in 2014, partly bogged down by Russia's recession, which could affect other markets.

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