NFL- Best win% - 18 year intervals - since the merger

RANK	TEAM	FROM	TO	G	W	L	T	PCT
1	NWE	2001	2018	288	220	68	0	0.764
2	NWE	2000	2017	288	214	74	0	0.743
3	SFO	1981	1998	280	207	72	1	0.741
4	NWE	1999	2016	288	209	79	0	0.726
5	SFO	1980	1997	280	201	78	1	0.720
6	SFO	1984	2001	287	203	83	1	0.709
6	SFO	1982	1999	280	198	81	1	0.709
8	NWE	1998	2015	288	204	84	0	0.708
9	SFO	1983	2000	287	201	85	1	0.702
10	NWE	1997	2014	288	202	86	0	0.701
10	MIA	1970	1987	264	184	78	2	0.701
12	NWE	1996	2013	288	201	87	0	0.698
13	SFO	1985	2002	287	198	88	1	0.692
14	SFO	1986	2003	287	195	91	1	0.681
15	SFO	1979	1996	280	190	89	1	0.680
15	MIA	1971	1988	266	180	84	2	0.680
17	NWE	1995	2012	288	195	93	0	0.677
18	NWE	1994	2011	288	193	95	0	0.670
19	MIA	1972	1989	268	178	89	1	0.666
20	MIA	1973	1990	270	176	93	1	0.654
21	SFO	1987	2004	287	187	100	0	0.652
22	WAS	1974	1991	272	176	96	0	0.647
23	SFO	1978	1995	280	180	99	1	0.645
24	NWE	1993	2010	288	185	103	0	0.642
25	WAS	1975	1992	274	175	99	0	0.639
26	MIA	1977	1994	278	175	102	1	0.631
27	PIT	1992	2009	288	180	107	1	0.627
28	MIA	1976	1993	276	171	104	1	0.621
29	PIT	1991	2008	288	178	109	1	0.620
30	SFO	1988	2005	288	178	110	0	0.618
31	PIT	1990	2007	288	175	112	1	0.609
32	DEN	1989	2006	288	175	113	0	0.608
32	SFO	1989	2006	288	175	113	0	0.608