How many iPod nano 7s have been sold and how many 5's have been sold and how many 6's have been sold?

Apple has not disclosed specific sales figures for the iPod Nano 7th generation, 5th generation, or 6th generation models. However, it is known that the iPod Nano series overall sold over 100 million units since its introduction in 2005. Individual sales numbers for each generation, including the 5th and 6th, remain unavailable to the public.