It really depends. In general, the 3% has been the number but that number goes down to compensate for times like this when the real wage is decreasing for the private sector worker. Keep in mind, government wages don't increase like private sector wages do when times are good. It's more stable but not wealthier.
it's a 3% cost of living allowance every year plus the payraise which is usually around 6% ( then promotions). Not sure the private sector gets 6% a year on average? I think the average wage hasn't increased much at all last few years. At GE they offered the union workers that were layed off $18 an hour instead of $26 they were making previously and they accepted . Prety rough out there right now.