Friendly nitpick, because I had a double-take when reading the second paragraph: Be careful to differentiate between "install base" and "base install". In both cases, you are referring to "installed size of the database in its base configuration". But "install base" commonly means "number of installations". So I was very confused when the second paragraph was implying (using the standard meaning for "install base") that the number of Postgres installations had not grown over the years.