The closing of Norton Air Force Base in 1994 resulted in the loss of 10,000 military and civilian jobs and sent San Bernardino's economy into a downturn that has been somewhat offset by more recent growth in the intermodal shipping industry. The jobless rate in the region rose to more than 12 percent during the years immediately after the base closing. As of 2007 households within one mile of the city core had a median income of only $20,480, less than half that of the Inland region as a whole. Over 15 percent of San Bernardino residents are unemployed as of 2012, and over 40 percent are on some form of public assistance. According to the US Census, 34.6 percent of residents live below the poverty level, making San Bernardino the poorest city for its population in California, and the second poorest in the US next to Detroit.