I never open them.
Good. Don't.
Is there any way to solve or reduce these emails?
Just wait.
Coming across the pond over here and using your email would not do this. Giving your email address to some site or company probably did - and that could have happened no matter where you were.
The best solution is to just wait and eventually the spammer will get blacklisted and these will die down. Your email address is out there now, so it is likely you will never stop getting spam. That just seems to be a fact of life these days. Just keep your OS and security updated, and stay vigilant about not being "click-happy" on those unsolicited emails, attachments, downloads and popups.