I've always considered this band at the top of the food chain in their genre, but I literally can't even remember how many releases they've had in the past 4 years. I know it's a minimum of 4 and that's even too much new music in one small span of time for me. A&D was the last full album I knew from them.
They've released 4 full lengths after A&D, which means 4 albums in 6 years, not an incredible amount.
you really should check out the new album, it's killer.