astros all-time winning percentage until 2014

The Houston Astros managed a win percentage of .487 before 2015.

	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	Colt .45's	.400	1962	64	96	162	5,558	592	1,370	170	47	105	549	493	38	806	42	30	6,198	1,949	322	75	34	37	132	.246	.310	.351	.661
2	Colt .45's	.407	1963	66	96	162	5,384	464	1,184	170	39	62	420	456	30	938	39	30	5,983	1,618	271	86	27	39	119	.220	.283	.301	.584
3	Colt .45's	.407	1964	66	96	162	5,303	495	1,214	162	41	70	452	381	49	872	40	48	5,859	1,668	273	87	39	44	113	.229	.285	.315	.599
4	Astros	.401	1965	65	97	162	5,483	569	1,299	188	42	97	523	502	46	877	90	37	6,122	1,862	327	57	34	46	125	.237	.305	.340	.644
5	Astros	.444	1966	72	90	163	5,511	612	1,405	203	35	112	570	491	34	885	90	47	6,170	2,014	350	97	37	61	128	.255	.318	.365	.683
6	Astros	.426	1967	69	93	162	5,506	626	1,372	259	46	93	581	537	26	934	88	38	6,177	2,002	398	65	43	88	123	.249	.317	.364	.680
7	Astros	.444	1968	72	90	162	5,336	510	1,233	205	28	66	473	479	48	988	44	51	5,994	1,692	299	97	34	81	115	.231	.298	.317	.616
8	Astros	.500	1969	81	81	162	5,348	676	1,284	208	40	104	618	699	41	972	101	58	6,196	1,884	352	68	40	70	109	.240	.330	.352	.683
9	Astros	.488	1970	79	83	162	5,574	744	1,446	250	47	129	694	598	27	911	114	41	6,305	2,177	426	63	43	81	144	.259	.332	.391	.722
10	Astros	.488	1971	79	83	162	5,492	585	1,319	230	52	71	547	478	29	888	101	51	6,105	1,866	353	65	41	44	105	.240	.302	.340	.642
11	Astros	.549	1972	84	69	153	5,267	708	1,359	233	38	134	660	524	32	907	111	56	5,936	2,070	405	62	51	69	98	.258	.326	.393	.719
12	Astros	.506	1973	82	80	162	5,532	681	1,391	216	35	134	634	469	33	962	92	48	6,153	2,079	385	83	36	72	135	.251	.312	.376	.688
13	Astros	.500	1974	81	81	162	5,489	653	1,441	222	41	110	603	471	29	864	108	65	6,120	2,075	373	83	48	49	124	.263	.322	.378	.700
14	Astros	.398	1975	64	97	162	5,515	664	1,401	218	54	84	606	523	32	762	133	62	6,211	1,979	356	97	44	66	118	.254	.320	.359	.679
15	Astros	.494	1976	80	82	162	5,464	625	1,401	195	50	66	571	530	21	719	150	57	6,111	1,894	311	57	39	54	127	.256	.322	.347	.669
16	Astros	.500	1977	81	81	162	5,530	680	1,405	263	60	114	638	515	40	839	187	72	6,200	2,130	437	76	39	60	98	.254	.320	.385	.705
17	Astros	.457	1978	74	88	162	5,458	605	1,408	231	45	70	557	434	22	743	178	59	6,034	1,939	346	76	44	67	134	.258	.313	.355	.668
18	Astros	.549	1979	89	73	162	5,394	583	1,382	224	52	49	542	461	22	745	190	95	6,029	1,857	325	109	43	75	105	.256	.315	.344	.659
19	Astros	.571	1980	93	70	163	5,566	637	1,455	231	67	75	599	540	13	755	194	74	6,253	2,045	373	89	45	73	96	.261	.326	.367	.693
20	Astros	.555	1981	61	49	110	3,693	394	948	160	35	45	369	340	8	488	81	43	4,155	1,313	240	79	35	49	69	.257	.318	.356	.673
21	Astros	.475	1982	77	85	162	5,440	569	1,342	236	48	74	533	435	19	830	140	61	6,008	1,896	358	68	46	67	104	.247	.302	.349	.651
22	Astros	.525	1983	85	77	162	5,502	643	1,412	239	60	97	615	517	19	869	164	95	6,173	2,062	396	81	54	71	76	.257	.320	.375	.695
23	Astros	.494	1984	80	82	162	5,548	693	1,465	222	67	79	640	494	17	837	105	61	6,201	2,058	368	87	55	57	88	.264	.323	.371	.694
24	Astros	.512	1985	83	79	162	5,582	706	1,457	261	42	121	666	477	23	873	96	56	6,192	2,165	424	66	44	63	127	.261	.319	.388	.707
25	Astros	.593	1986	96	66	162	5,441	654	1,388	244	32	125	613	536	24	916	163	75	6,095	2,071	401	53	41	78	126	.255	.322	.381	.703
	Total	.487		4,120	4,337	8,462	286,914	35,054	72,904	13,093	1,969	6,306	32,853	27,159	2,294	51,004	6,308	2,831	322,519	108,853	21,368	3,882	2,270	2,930	6,146	.254	.321	.379	.701