Python in CS1 is Growing Fast

From Mark Guzdial’s ever-informative blog:

I just got a report…on the state of the Python CS1 market. The market size is estimated to be about 20,300 students per year, up 45% since last year. The market has had around 40% gains for each of the last three years.

Yay! But I wonder what they count as “the market”, and how big the absolute share (as opposed to growth) is… Anyone know?