If you add the 25.1% of sites that use JSON-LD to the 46.3% of sites that don’t use any structured data, you have a total of 71.4.

PulpMiner is a no-code platform that allows users to extract structured data from any public webpage and convert it into a ...

Google’s stated preference is for JSON-LD. It may be in your best interest to consider switching over to JSON-LD structured data if you currently use microdata.