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Only ? Looks like a big number for worldwide usage, no ?

WP itself usually puts the estimate at 25-30%.

W3techs measures the top 10 million sites and has stats like that. See https://w3techs.com/technologies/overview/content_management...

The WordPress.org home page says 34%: https://wordpress.org/

Right, originally I read 1% and was surprised, but that's massive usage