In America, I think drivers don't know how to drive around cyclists, so quite a few will drive frighteningly close. I wouldn't care to guess about the percentage.

But even 1% is a lot of people. A bicycle even on a short trip will be passed by 10s of cars. So, if you bike everywhere, that might be 1 close call a day. So, I'm guessing that Spain is not actually as dangerous as 1% and you were just picking a large number.