I host a bunch of websites for normal small businesses many of them have contact forms and all of them have captcha.
We've seen a steady rise in spam that gets through it over the last year or so. I don't have any concrete numbers at hand, but we've heard from customers that they used to get a few spam replies once in a while before but get 10-20 a day over prolonged periods of time now.
I wouldn't be surprised if we're aproaching a point where computers are better at solving captchas than human.