The lowest version of browsers in use

First of all sorry if my English is bad. I am developing a website and I want to know what the lowest version of browsers are in use now?

For example, this is “range” input “browser support” table:

Chrome Edge Firefox Safari Opera
4.0 10.0 23.0 3.1 10.1

How can I know how many devices are using this versions? Can anyone introduce me to a source?

Answer

https://caniuse.com/

“Can I use provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.”

You can hover over the browser versions to see their usage percentages:

A screenshot from caniuse.com showing the usage percentage