The New York Rangers had their best power-play percentage in a season in 1977-78, at 28.8 percent.

when did the rangers have their best power play percentage in a season

TEAM	PP%	SEASON	GP	W	L	T	OTL	PTS	PTS%	G	GA	PK%	S/GP	SA/GP
New York Rangers	28.8	1977-78	80	30	37	13		73	.456	279	280	80.2	28.14	31.38
New York Rangers	26.4	2023-24	82	55	23		4	114	.695	278	226	84.5	31.49	29.50
New York Rangers	25.7	1979-80	80	38	32	10		86	.538	308	284	82.2	29.79	28.69
New York Rangers	25.2	2021-22	82	52	24		6	110	.671	250	204	82.3	29.17	30.83
New York Rangers	25.1	1983-84	80	42	29	9		93	.581	314	304	78.1	31.89	31.55
New York Rangers	24.1	2022-23	82	47	22		13	107	.652	273	216	81.2	31.49	29.33
New York Rangers	24.0	1984-85	80	26	44	10		62	.388	295	345	80.6	29.80	35.11
New York Rangers	23.9	1978-79	80	40	29	11		91	.569	316	292	74.7	30.89	27.75
New York Rangers	23.7	1990-91	80	36	31	13		85	.531	297	265	79.8	30.55	31.88
New York Rangers	23.3	1989-90	80	36	31	13		85	.531	279	267	78.7	29.81	30.04
New York Rangers	23.0	1993-94	84	52	24	8		112	.667	299	231	84.6	34.18	27.71
New York Rangers	22.9	1982-83	80	35	35	10		80	.500	306	287	75.4	28.53	29.80
New York Rangers	22.9	2019-20	70	37	28		5	79	.564	233	220	77.4	31.07	34.01
New York Rangers	22.6	1987-88	80	36	34	10		82	.513	300	283	80.6	31.76	30.48
New York Rangers	22.2	1981-82	80	39	27	14		92	.575	316	306	76.3	28.56	29.45
New York Rangers	22.0	1996-97	82	38	34	10		86	.524	258	231	79.9	30.83	31.56
New York Rangers	21.2	2017-18	82	34	39		9	77	.470	228	263	81.5	30.95	35.34
New York Rangers	20.9	1991-92	80	50	25	5		105	.656	321	246	84.8	32.91	31.79
New York Rangers	20.7	2020-21	56	27	23		6	60	.536	176	155	82.2	28.70	29.71
New York Rangers	20.4	1998-99	82	33	38	11		77	.470	217	227	85.7	25.43	30.20
New York Rangers	20.2	2016-17	82	48	28		6	102	.622	253	216	79.8	29.73	30.06
New York Rangers	20.1	1985-86	80	36	38	6		78	.488	280	276	77.7	31.83	29.98
New York Rangers	20.0	1994-95	48	22	23	3		47	.490	139	134	83.9	31.85	26.31
New York Rangers	19.9	1986-87	80	34	38	8		76	.475	307	323	81.1	30.90	31.96
New York Rangers	19.8	1995-96	82	41	27	14		96	.585	272	237	82.0	32.57	30.16