Interesting question
Actually Europe still has lingering iodine deficiency since they were much later starting the iodinization of salt than the US, not until the 90's I believe. And of course as the Europeans charge more for the iodized salt many people don't buy it.
But as rvb stated, if you take a standard multi-vitamin, you will get the RDA of iodine. My diet also includes rich iodine sources anyway from shellfish, seaweed, miso soup (from the kelp in the broth) and the like.
So even though Marg spoiled me on French fleur de sel, I won't be having iodine deficiency ; )