The cost of imprisoning each of California’s 130,000 inmates is expected to reach a record $75,560 in the next year, enough to cover the annual cost of attending Harvard University and still have plenty left over for pizza and beer.

The price for each inmate has doubled since 2005, even as court orders related to overcrowding have reduced the population by about one-quarter. Salaries and benefits for prison guards and medical providers drove much of the increase.

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Joan Petersilia, co-director of the Stanford Criminal Justice Center, said it was “highly predictable” that per-inmate costs would increase even as the population decreased.

“We released all the low-risk, kind of low-need and we kept in the high-risk, high-need,” she said.