California's autism Increase

Autism Explosion: California Department of Developmental Services Autism Cases, 1989-2014

December 2014 California Dept of Developmental Services CDER case records, by county
This PDF, a report that is issued quarterly, shows Regional Center developmental disability cases, statewide and by county. As of December 2014, California counts more than 75,000 DDS Autism cases.

For every one Californian with DDS-eligible Autism in 1990, there are more than 20 today:

California Autism Population, by Birth Year, DDS Cases Only