There's a block every 10 minutes, but the number of bitcoins minted per block goes down over time. It used to be that 50 bitcoins were minted every block, but currently only 12.5 are minted each block. The amount minted halves every four years. (Personally, I think it's too extreme that it instantly goes from x to x/2 in one block. The mining rate generally dips a bit for a while when this happens. I think it would have been better for the minting to decrease in a much smoother way.)