I could not give you an exact figure.
I will say though that Europe does not have the same climate as we do. With regard to Europe, people are often talking about England and France, which do not have our nordic climate.
There are certainly swine being transported to Mexico, for example, and some transporters have the necessary equipment to water the animals. That equipment is turned off in the winter, though, or else it would freeze. I would say those systems are quite expensive.