What numbers, the ones you make up in your head? Care to cite them?
ASD is 1-in-68. Do you really think measles, mumps and rubella were ever this prevalent? Their rates were measured by the 10s per 100,000 -far lower than the 1500 per 100,000 rate of ASD. And did these diseases leave their victims brain damaged?
http://www.parents.com/blogs/red-hot-parenting/2014/03/28/health/1-in-68-the-new-data-on-autism-spectrum-disorder/
As for the effects of vaccines, excluding small pox and diphtheria, disease infection rates were reduced through improvements in public sanitation and hygiene rather than introduction of a vaccine.
http://www.healthsentinel.com/joomla/index.php?option=com_content&view=article&id=2662:historic-data-shows-vaccines-not-key-in-declines-in-death-from-disease&catid=5:original&Itemid=24