Since moving to Oakland in 1968, the Athletics have consistently churned out star-studded teams, winning four World Series and making the playoffs 16 times.
The A's have built dynasties on the backs of homegrown players, who inevitably leave for higher paychecks elsewhere. A young core carried the A's in the early 1970s, late 80s, early 90s and early 2000s.
Teams were ranked on the players' production that year, with little focus on postseason success. A good team will consistently play well over the course of a season, but can be booted from the playoffs after a couple bad games.
I also tried to avoid including teams that stayed intact from year to year, because mentioning the same players again and again would be repetitive and boring. So while the A's had great teams in 1972 and 1973, all the key players were still on board, so only one year makes the list.