NFL - Highest Win % over a 20-year period since the merger

RANK	TEAM	FROM	TO	G	W	L	T	PCT
1	NWE	1999	2018	320	233	87	0	0.728
2	NWE	1998	2017	320	231	89	0	0.722
3	NWE	1997	2016	320	228	92	0	0.713
4	NWE	1996	2015	320	225	95	0	0.703
11	NWE	1995	2014	320	219	101	0	0.684
12	NWE	1994	2013	320	217	103	0	0.678
17	NWE	1993	2012	320	210	110	0	0.656
20	PIT	1992	2011	320	204	115	1	0.639
26	PIT	1991	2010	320	199	120	1	0.623
28	PIT	1990	2009	320	196	123	1	0.614
28	PIT	1989	2008	320	196	123	1	0.614
30	SFO*	1988	2007	320	190	130	0	0.594
30	DEN*	1988	2007	320	190	130	0	0.594
27	SFO	1987	2006	319	198	121	0	0.621
23	SFO	1986	2005	319	201	117	1	0.632
18	SFO	1985	2004	319	207	111	1	0.650
9	SFO	1984	2003	319	220	98	1	0.691
5	SFO	1983	2002	319	223	95	1	0.701
8	SFO	1982	2001	312	216	95	1	0.694
6	SFO	1981	2000	312	217	94	1	0.697
6	SFO	1980	1999	312	217	94	1	0.697
9	SFO	1979	1998	312	215	96	1	0.691
16	SFO	1978	1997	312	205	106	1	0.659
21	SFO	1977	1996	310	197	112	1	0.637
24	SFO	1976	1995	308	193	114	1	0.628
25	MIA	1975	1994	306	191	114	1	0.626
22	MIA	1974	1993	304	192	111	1	0.633
19	MIA	1973	1992	302	195	106	1	0.647
15	MIA	1972	1991	300	198	101	1	0.662
13	MIA	1971	1990	298	200	96	2	0.674
14	MIA	1970	1989	296	198	96	2	0.672
* - SFO/DEN tied - (1988-2007)