This is data that was taken over a 12 year period to identify the amount of children who were diagnosed with ASD in the USA.

1. Has the prevalence of autism increased or decreased over the 12 year period?

2. Has the increase or decrease been significant or insignificant over the 12 year period?

3. Has the prevalence of autism leveled off over the 12 year period?

https://spectrumnews.org/news/u-s-stats-show-autism-rate-reaching-possible-plateau/