As noted previously, thimerosal was removed from vaccines nationwide, phasing out production by 2001. California passed a law prohiting the administration of vaccines with thimerosal in pregnant women and children under 3 from 2006 onwards. So, kids 3-5 in 2012 did not receive thimerosal from vaccines. And there are more kids in the Autism special ed category in 2012 than in any year previously. The trend is a relatlively smooth increase over time.
It is very clear that these data do not in any way indicate a drop in the increase in autism special ed rates with the removal of thimerosal.