Huh? This is publicly available information published by BART. Civic Center is used a lot, but isn't in the top 3. 16th St is more on par with stops in Berkeley or Oakland and isn't used much. 24th St is used even less. Civic Center is used much more often as an exit station (e.g. to commute to) than an entry station (e.g. where people live.) The most used stops are Embarcadero, Montgomery, and Powell.
