The usage shares of your site highly depends on your target audience. E.g. no Internet Explorer has ever seen hollyapp.com Show archive.org snapshot , but that's because of its tech-savvy audience. Distribution will also differ by other factors, such as region. See this Wikipedia article Show archive.org snapshot for details.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

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If you don't know your audience, you can use the stats of tracking tools, which see a lot of traffic go by a wide variety of sites. Some of these are:

• W3Counter Show archive.org snapshot
• Clicky Show archive.org snapshot
• StatOwl Show archive.org snapshot