This figure includes the one odd macOS X release: 10.2.7. Some random notes, updated from the original post: This has happened a few times over the years. This is to keep the version numbers in the proper order, even when an older OS received an update after a major new release came out.
Some entries may appear out of chronological order (i.e. Note: The Days column reflects the number of days between releases. Ⓘ Leopard - First universal binary release Ⓘ Snow Leopard - First Intel-only release Ⓘ Lion - App Store only (USB stick later) Ⓘ Ventura (Taxes were too high in Santa Barbara?)
Ⓘ First-ever 'rapid release' security update
