Some data on the size savings from the glyf transform in woff2

On our last call a question came up about how many bytes the glyf transform
in woff2 saves (post brotli compression). I found some data from an
analysis done back in 2016, you can see the results here:
https://docs.google.com/spreadsheets/d/1_ZYTFaG6_NJy7n_t-RpPDXCAZIKDP_1SXiJQz0o8QMg/edit?usp=sharing

This looks to have been run against a selection of fonts from the open
source Google Fonts collection at the time.

That data shows that overall there's a median *reduction of ~14% in the
post brotli file size* due to the glyf transform.