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

The Cincinnati Reds won 63.0 percent of the time in 1976.

	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	.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
2	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
3	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
4	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
5	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
6	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
7	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
8	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
9	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
10	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
11	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
12	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
13	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
14	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
15	Phillies	.623	1977	101	61	162	5,546	847	1,548	266	56	186	795	573	38	806	135	68	6,290	2,484	508	59	74	75	121	.279	.346	.448	.794
16	Dodgers	.605	1977	98	64	162	5,589	769	1,484	223	28	191	729	588	23	896	114	62	6,327	2,336	442	83	44	67	103	.266	.336	.418	.753
17	Cardinals	.512	1977	83	79	162	5,527	737	1,490	252	56	96	686	489	25	823	134	112	6,136	2,142	404	66	29	71	111	.270	.330	.388	.718
18	Red Sox	.602	1977	97	64	161	5,510	859	1,551	258	56	213	828	528	42	905	66	47	6,184	2,560	527	45	59	38	132	.281	.345	.465	.810
19	White Sox	.556	1977	90	72	162	5,633	844	1,568	254	52	192	809	559	34	666	42	44	6,322	2,502	498	33	63	46	120	.278	.344	.444	.788
20	Orioles	.602	1977	97	64	161	5,494	719	1,433	231	25	148	677	560	24	945	90	51	6,173	2,158	404	48	47	50	132	.261	.329	.393	.722
21	Twins	.522	1977	84	77	161	5,639	867	1,588	273	60	123	804	563	43	754	105	65	6,382	2,350	456	81	56	53	115	.282	.348	.417	.765
22	Yankees	.617	1977	100	62	162	5,605	831	1,576	267	47	184	784	533	28	681	93	57	6,260	2,489	498	46	48	49	117	.281	.344	.444	.788
23	Rangers	.580	1977	94	68	162	5,541	767	1,497	265	39	135	704	596	39	904	154	85	6,342	2,245	439	116	50	47	122	.270	.342	.405	.748
24	Royals	.630	1977	102	60	162	5,594	822	1,549	299	77	146	773	522	45	687	170	89	6,268	2,440	522	49	58	49	102	.277	.340	.436	.776
25	Reds	.571	1978	92	69	161	5,392	710	1,378	270	32	136	669	636	26	899	137	58	6,192	2,120	438	84	54	72	112	.256	.334	.393	.727