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SAN DIEGO — As a market for a National Football League franchise, San Diego is decidedly average, according to a study released Friday.

The National University System Institute for Policy Research compared San Diego County demographics to the other metropolitan areas that host NFL teams to quantify the region’s ability to afford a new stadium for the Chargers.

“We fall right in the middle when compared to these other 29 regions where the NFL plays,” said NUSIPR President Erik Bruvold, who authored the report. “We are neither really big nor really small when it comes to markets where the NFL has a presence.”

He said the study shows it will be unlikely that a new facility could be built purely from private sources.

San Diego’s strength — besides fair weather and a 50-year-plus history of supporting the Chargers — is a median household income of nearly $63,000, putting it eighth among NFL metro areas, Bruvold said.

San Diego falls smack in the middle of other categories for the NFL’s 30 markets, Bruvold said. The NFL has 32 franchises, but New York and the San Francisco Bay Area each have two teams.

While the median household income in San Diego is relatively high, the 319,000 households that earn more than $100,000 annually is average, he said.

The high-earning category is critical because it shows the region’s capacity to purchase personal seat licenses, which other teams have used to generate the revenue needed to build a stadium.

“Los Angeles, in contrast, had 1.2 million households with incomes over $100,000,” Bruvold wrote.

He said San Diego might be able to raise between $100 million and $150 million by selling personal seat licenses, which give the purchaser the right to buy season tickets.

“However, it is also the case that when you do the comparative work it is very difficult to see how the public’s contribution will not be somewhere around 60-70 percent,” Bruvold said. “We might get a better deal, but I wouldn’t count on it.”

The Chargers, in conjunction with the Oakland Raiders, have taken steps toward developing a stadium project in the Los Angeles suburb of Carson, in case they can’t get new playing facilities built in their current cities.

San Diego ranks 17 in the number of companies with at least 250 employees, signifying large firms that might have an appetite for the NFL’s luxury boxes and club seats, and its population of 3.1 million is ranked 15th, Bruvold said.

The Chargers have been pining for a new home for years to replace aging Qualcomm Stadium.

A nine-member task force appointed by San Diego Mayor Kevin Faulconer is deciding whether to locate a stadium downtown or the current site in Mission Valley, and developing a financing plan.

The group is expected to announce its decision on a location in a couple of weeks. The financing plan is due in May.

Public financing for such a facility would be put to a public vote next year.