Verified answer

I cruised on Royal Caribbean out of Barcelona a couple years ago and on our cruise the passengers were from a variety of countries, not just America OR Europe. While there were a lot from the US there were also some from Canada, Australia, Germany, France, the Philippines, Mexico, and even some from South America. So there is no set formula for what the passenger demographics will be. On our cruise there were a significant enough number of people from a variety of countries that they made all announcements in English, Spanish, French, German and some others.

It will be a 50/50 mix.

I worked on a ship for Royal Caribbean that sailed in Europe, and generally it was about a 50/50 mix.