There is a HUGE amount of information at
https://catinfo.org/
They also have a break-down nutrition chart:
https://catinfo.org/docs/SortableCatFoodChartCatinfo.org2-22-13.htm
(it doesn't have iodine content though. My kitty was just diagnosed with possible hyperthyroidism)
This is a must-read! I've been doing it all wrong.
Never knew the major differences between canned and dry. Calories. Proteins.
Canned is so much better and they explain why.