number of seasons with a win percentage above 50% for each mlb each team the last 50 years by team

The Cincinnati Reds won 65.1 percent of the time in 1975.

	TEAM	W%	SEASON	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Reds	.651	1975	28	15	43	1,456	208	380	59	8	24	188	175	12	230	56	7	1,668	527	91	15	10	18	28	.261	.343	.362	.705
2	Pirates	.610	1975	25	16	41	1,376	208	369	72	10	32	194	138	9	242	9	8	1,548	557	114	16	9	12	32	.268	.337	.405	.742
3	Dodgers	.571	1975	24	18	42	1,441	168	361	62	11	28	157	140	11	226	40	15	1,633	529	101	26	15	16	22	.251	.319	.367	.686
4	Red Sox	.575	1975	23	17	40	1,361	184	372	72	14	24	171	119	11	173	19	10	1,524	544	110	16	17	9	29	.273	.333	.400	.733
5	Indians	.628	1975	27	16	43	1,456	201	410	58	9	41	186	136	10	180	31	27	1,630	609	108	15	13	9	36	.282	.344	.418	.763
6	Orioles	.610	1975	25	16	41	1,438	161	368	56	7	27	146	126	9	232	36	12	1,601	519	90	15	13	14	36	.256	.317	.361	.678
7	Athletics	.619	1975	26	16	42	1,424	214	378	65	8	42	198	164	12	227	51	21	1,627	585	115	19	8	13	29	.265	.345	.411	.755
8	Twins	.553	1975	21	17	38	1,322	153	362	48	9	24	137	126	13	162	18	7	1,494	500	81	20	13	15	26	.274	.340	.378	.718
9	Yankees	.512	1975	21	20	41	1,408	178	391	79	7	33	170	139	4	179	35	15	1,574	583	119	12	11	14	36	.278	.342	.414	.756
10	Royals	.591	1975	26	18	44	1,506	183	394	70	24	24	167	148	5	181	38	22	1,689	584	118	16	14	11	28	.262	.327	.388	.715
11	Expos	.578	1975	26	19	45	1,568	182	379	60	7	30	156	181	4	265	33	16	1,793	543	97	27	13	24	26	.242	.319	.346	.666
12	Reds	.630	1976	102	60	162	5,702	857	1,599	271	63	141	802	681	28	902	210	57	6,538	2,419	475	67	60	64	103	.280	.357	.424	.781
13	Pirates	.568	1976	92	70	162	5,604	708	1,499	249	56	110	660	433	29	807	130	45	6,177	2,190	415	61	50	57	131	.267	.321	.391	.711
14	Phillies	.623	1976	101	61	162	5,528	770	1,505	259	45	110	708	542	40	793	127	70	6,236	2,184	414	59	67	55	118	.272	.338	.395	.733
15	Dodgers	.568	1976	92	70	162	5,472	608	1,371	200	34	91	561	486	29	744	144	55	6,125	1,912	325	91	47	71	130	.251	.313	.349	.662
16	Red Sox	.512	1976	83	79	162	5,511	716	1,448	257	53	134	664	500	29	832	95	70	6,154	2,213	444	55	59	35	127	.263	.324	.402	.726
17	Indians	.509	1976	81	78	159	5,412	615	1,423	189	38	85	567	479	11	631	75	69	6,029	1,943	312	67	60	42	141	.263	.321	.359	.680
18	Orioles	.543	1976	88	74	162	5,457	619	1,326	213	28	119	576	519	23	883	150	61	6,091	1,952	360	57	35	34	119	.243	.310	.358	.667
19	Athletics	.540	1976	87	74	161	5,353	686	1,319	208	33	113	625	592	45	818	341	123	6,106	1,932	354	58	58	45	91	.246	.323	.361	.684
20	Twins	.525	1976	85	77	162	5,574	743	1,526	222	51	81	691	550	41	714	146	75	6,307	2,093	354	93	49	39	121	.274	.341	.375	.716
21	Yankees	.610	1976	97	62	159	5,555	730	1,496	231	36	120	681	469	35	616	163	65	6,155	2,159	387	50	46	36	95	.269	.328	.389	.716
22	Mets	.531	1976	86	76	162	5,415	615	1,334	198	34	102	560	561	28	797	66	58	6,129	1,906	334	92	33	53	127	.246	.319	.352	.671
23	Royals	.556	1976	90	72	162	5,540	713	1,490	259	57	65	656	484	31	650	218	105	6,197	2,058	381	71	71	36	104	.269	.327	.371	.699
24	Reds	.543	1977	88	74	162	5,524	802	1,513	269	42	181	750	600	25	911	170	64	6,261	2,409	492	62	50	63	113	.274	.345	.436	.781
25	Pirates	.593	1977	96	66	162	5,662	734	1,550	278	57	133	678	474	34	878	260	120	6,262	2,341	468	49	43	74	96	.274	.331	.413	.745