There is obviously a lot of uncertainty in this dataset. For example it's entirely possible one pencil may simply have rolled off the table at one point in these 3 years and be forgotten hidden under the couch for weeks.

I do all the sharpening. Unlike regular pencils however, you can keep using these even when the point is more or less flat, due to its large size. Though it feels painful to watch, my toddler doesn't seem to be bothered by flat tips at all...