Full stop I am super convinced that Ravenclaw has the lowest sorting percentages each year.
Because you are sorted by what you value most, and who the fuck values creativity? – Ambition? Bravery? Loyalty? ALL YEAH. But creativity? Honestly people think it’s useless. Parents teach kids that art is not a real job, making the connection between creativity = art = useless, not necessary and completely fail to realize that a lot of inventions come from somebody resourceful who had a problem and was creative enough to solve it with his given means. So the kids grow up and have this skewed view of creative being not a very useful thing, and even if they have art as a hobby in their past-time, *they do not value it most of all* and get sorted into another house.
Also I will bet somebody’s left hand that most of Ravenclaw’s sorting comes from parents who were rich enough to be academics and encouraged their child’s personal interests etc. and taught them that being curious and keep learning is integral to stay ahead of the curve life throws you, and not the creativity part. TL;DR Ravenclaws are most likely from richer families, have academic parents, or are the complete opposite and come from an environment that encouraged and rewarded and required resourcefulness (aka street-smarts). Also they have a very big percentage of misfits to whom the whole art-creativity is the way to express themselves.