From zero. There is now one proven cancer patient. From Japan's NHK News Service:
Fukushima worker to get cancer compensation
Japan's labor ministry says it will provide compensation to a man confirmed to have developed cancer as a result of working at nuclear power plants including Fukushima Daiichi.
The man was in his late 30s when he worked from November 2011 to December 2013 at various nuclear plants. They include the Fukushima Daiichi plant that suffered a meltdown in March 2011.
The labor ministry says the man discovered he had the illness after quitting his job at Fukushima Daiichi. He applied for compensation granted to workers suffering from work-related illnesses.
The ministry decided to accept the application and notified him of the decision on Tuesday. Ministry experts determined that he was likely to have contracted leukemia following cleanup work at Fukushima Daiichi. They found he had been exposed to a total of 19.8 millisieverts of radiation from his work at various plants. He was exposed to 15.7 millisieverts at the Fukushima plant.
And the overall state of the Japanese Nuclear Industry?
Ministry officials say that so far, 13 nuclear plant workers have been granted compensation for work-related cancer. This is the first such case involving the Fukushima plant.
And some more pesky numbers:
About 45,000 people have been involved in work at the Fukushima plant since the accident. More than 21,000 of them have been exposed to annual radiation levels of 5 millisieverts.
Anything more is just scare-mongering and does nothing to advance science, medicine or the credibility of those people who would like to shut down both.
Holding your ears and yelling LALALALALA is not evidence...