Do you recycle copper pennies?

Up here, pennies are been removed from circulation since about a decade, but I wonder how much is sitting a bit everywhere: pennies that have not been returned to the banks, U.S. pennies coming in the change from trips in the States and so on. When Canadian pennies were in circulation, U.S. pennies were very frequent in our change. Maybe 4-5% of our pennies, but much harder to find in nickels and up. Once I found a penny from Panama in my change and a Barbados quarter another time.