Which country is the leading producer of cork stoppers?

Player #25874027, yes, less about the company and more about the stuff itself would be welcome. Quercus Suber, the cork oak. A sustainable harvest of its bark cork layer every few years allows the trees to survive and thrive. A wonderful natural product.

It would have been a much more interesting answer if it had included the information that the cork is produced from a specific Oak tree found in Portugal . The scientific classification name of oak is Quercus. I think it is made from the bark.