I'm talking hard fact, you're putting stuff from I don't know where. It's a fact that the critically acclaimed and box office hit that was 28 Days Later gave rise to the zombie boom that would go across not only movies, but also books and video games, and eventually find its way onto television YEARS after the fact. The Walking Dead was just riding a wave that had been going on pretty strong for a number of years before it ever aired, and comic hits a year into this wave being a thing.
No, you can pretty easily just look it up, there was more zombie stuff being made in, say, 2009 than there was last year.