How many people actually use the salt shaker?

Like there is so much salt in processed food I never felt the need to actually use the salt shaker (until I cut out processed food).

What does this mean for iodine intake? [FYI iodine was added to salt a long time ago because they found people were low in iodine. At the time people used salt shakers. Are we low now because, I'm figuring, people don't use salt shakers as much? Some googling says processed food doesn't use iodized salt.]