State gambling regulators say gross revenue from slot machines at Pennsylvania's 11 casinos was down 9.2 percent last month compared to the same month last year.

Valley Forge Casino (Facebook)

The Pennsylvania Gaming Control Board is reporting $195.9 million in gross revenue from slots in February, down from $215.7 million. February had an extra day last year, but the monthly decrease is another sign slots growth is leveling off.

The state's first casino opened in 2006 and the industry has seen rapid growth in Pennsylvania, which has grown into the nation's second-largest gambling market behind Las Vegas.

The latest numbers include $5 million in gross slots revenue from Valley Forge Casino Resort, which opened last March. The 10 casinos open during February 2012 and February 2013 showed an 11.5 percent decline.