Thus showing you don't know what you're talking about.
There is no rising problem with autism. There has been no actual increase in autism cases, there has been a big increase in correctly diagnosing autism. There were a lot of people who were being diagnosed as some form of retarded but they aren't stupid, they just weren't using that intelligence to interact with others.
http://www.webmd.com/brain/autism/searching-for-answers/autism-rise
Two researchers who tracked the rate of autism in children born in the same area of England from 1992 to 1995 and then from 1996 to 1998 found that the rates were comparable, and concluded that the incidence of autism was stable. The study was published in the American Journal of Psychiatry in 2005.
But, Milunsky says, several studies have documented an increase in the U.S.
In a recent report in the journal Archives of Disease in Childhood, Milunsky and his colleagues point to several studies finding an increase in autism rates. In 2003, for instance, a large study conducted in Atlanta found that one in 166 to one in 250 children had autism, according to a report published in the Journal of the American Medical Association.
Who says its all a matter of statistics and not a real increase? Being cocksure saves time but does not really mean much in and of itself.
Looking at the number of autism diagnoses isn't relevant here as the issue is prior misdiagnosis. Rather, the proper comparison is autism + retarded.