when was the last time the oakland a's win the world series

The Oakland Athletics have 4 wins in the World Series all-time.

	TEAM	DATE	SERIES W	SEASON	SERIES	TM		OPP	RESULT	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Athletics	10/14/1972	0	1972	World Series	OAK	@	CIN	W 3-2	27	3	4	0	0	2	3	4	0	1	0	2	32	10	2	1	0	0	0	.148	.258	.370	.628
2	Athletics	10/15/1972	0	1972	World Series	OAK	@	CIN	W 2-1	34	2	9	0	0	1	2	3	0	7	1	1	37	12	1	0	0	0	0	.265	.324	.353	.677
3	Athletics	10/18/1972	0	1972	World Series	OAK	vs	CIN	L 0-1	29	0	3	0	0	0	0	3	0	7	0	0	33	3	0	1	0	1	1	.103	.188	.103	.291
4	Athletics	10/19/1972	0	1972	World Series	OAK	vs	CIN	W 3-2	34	3	10	1	0	1	3	2	0	4	0	0	36	14	2	0	0	1	1	.294	.333	.412	.745
5	Athletics	10/20/1972	0	1972	World Series	OAK	vs	CIN	L 4-5	30	4	7	0	0	1	4	4	1	5	0	0	37	10	1	2	0	1	0	.233	.343	.333	.676
6	Athletics	10/21/1972	0	1972	World Series	OAK	@	CIN	L 1-8	34	1	7	1	0	0	1	1	0	4	0	0	35	8	1	0	0	0	0	.206	.229	.235	.464
7	Athletics	10/22/1972	1	1972	World Series	OAK	@	CIN	W 3-2	32	3	6	2	0	0	3	4	0	9	0	0	38	8	2	2	0	2	0	.188	.278	.250	.528
8	Athletics	10/13/1973	0	1973	World Series	OAK	vs	NYM	W 2-1	27	2	4	1	0	0	1	3	0	4	1	1	31	5	1	1	0	1	0	.148	.233	.185	.419
9	Athletics	10/14/1973	0	1973	World Series	OAK	vs	NYM	L 7-10	47	7	13	4	3	0	7	7	1	15	1	2	55	23	7	0	0	1	1	.277	.382	.489	.871
10	Athletics	10/16/1973	0	1973	World Series	OAK	@	NYM	W 3-2	42	3	10	3	0	0	3	3	0	14	1	0	46	13	3	1	0	1	0	.238	.289	.310	.598
11	Athletics	10/17/1973	0	1973	World Series	OAK	@	NYM	L 1-6	33	1	5	0	0	0	1	3	1	7	0	0	37	5	0	0	0	0	0	.152	.243	.152	.395
12	Athletics	10/18/1973	0	1973	World Series	OAK	@	NYM	L 0-2	29	0	3	1	0	0	0	7	0	7	0	0	36	4	1	0	0	0	1	.103	.278	.138	.416
13	Athletics	10/20/1973	0	1973	World Series	OAK	vs	NYM	W 3-1	30	3	7	2	0	0	3	3	0	7	0	1	34	9	2	0	1	0	0	.233	.294	.300	.594
14	Athletics	10/21/1973	1	1973	World Series	OAK	vs	NYM	W 5-2	33	5	9	1	0	2	5	2	0	8	0	0	35	16	3	0	0	0	0	.273	.314	.485	.799
15	Athletics	10/12/1974	0	1974	World Series	OAK	@	LAD	W 3-2	28	3	6	1	0	1	2	4	0	9	0	1	36	10	2	4	0	0	0	.214	.313	.357	.670
16	Athletics	10/13/1974	0	1974	World Series	OAK	@	LAD	L 2-3	31	2	6	2	0	0	2	2	1	11	0	0	34	8	2	0	0	0	2	.194	.265	.258	.523
17	Athletics	10/15/1974	0	1974	World Series	OAK	vs	LAD	W 3-2	29	3	5	1	0	0	2	5	0	9	1	0	35	6	1	1	0	0	0	.172	.294	.207	.501
18	Athletics	10/16/1974	0	1974	World Series	OAK	vs	LAD	W 5-2	26	5	7	0	0	1	5	4	1	6	0	1	33	10	1	2	0	1	1	.269	.387	.385	.772
19	Athletics	10/17/1974	1	1974	World Series	OAK	vs	LAD	W 3-2	28	3	6	0	0	2	3	1	0	7	2	1	30	12	2	0	1	0	0	.214	.233	.429	.662
20	Athletics	10/14/1989	0	1989	World Series	OAK	vs	SFG	W 5-0	36	5	11	0	0	2	4	2	0	8	0	0	38	17	2	0	0	0	0	.306	.342	.472	.814
21	Athletics	10/15/1989	0	1989	World Series	OAK	vs	SFG	W 5-1	29	5	7	3	1	1	5	5	0	7	1	1	34	15	5	0	0	1	1	.241	.353	.517	.870
22	Athletics	10/27/1989	0	1989	World Series	OAK	@	SFG	W 13-7	42	13	14	2	0	5	12	4	1	5	2	0	47	31	7	0	0	0	1	.333	.404	.738	1.142
23	Athletics	10/28/1989	1	1989	World Series	OAK	@	SFG	W 9-6	39	9	12	3	2	1	9	7	0	2	1	0	46	22	6	0	0	2	0	.308	.413	.564	.977
	Total		4							749	85	171	28	6	20	80	83	6	163	11	11	855	271	54	15	2	12	9	.228	.310	.362	.671