Could this be more claims instead of a higher incidence? The uptick coincides with the ACA, possibly with a little lag.
For the chances of a higher incidence I would say the way we raise our children these days is very different from when our parents raised us.
A lot of the food is processed, many environments were children play are close to sterile, etc.
This difference would probably be big enough to be noticed on a 10 year window.
[citation needed]