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

The Edmonton Oilers have the highest power-play percentage by a team in a season, at 32.4 percent in 2022-23.

	TEAM	PP%	SEASON	GP	W	L	T	OTL	PTS	PTS%	SOW	SOL	G	GA	DIFF	PK%	S/GP	S%	SA/GP	SV%
1	Oilers	32.4	2022-23	82	50	23		9	109	.665	0	4	325	256	69	77.0	33.59	11.8	31.37	.900
2	Canadiens	31.9	1977-78	80	59	10	11		129	.806			359	183	176	81.0	32.76	13.7	25.94	.912
3	Islanders	31.4	1977-78	80	48	17	15		111	.694			334	210	124	83.5	31.13	13.4	28.20	.907
4	Islanders	31.2	1978-79	80	51	15	14		116	.725			358	214	144	80.2	28.76	15.6	28.86	.907
5	Oilers	29.5	2019-20	71	37	25		9	83	.585	2	2	223	215	8	84.4	29.58	10.6	32.03	.905
6	Islanders	29.3	1980-81	80	48	18	14		110	.688			355	260	95	79.3	30.21	14.7	30.23	.892
7	Oilers	29.3	1982-83	80	47	21	12		106	.663			424	315	109	77.5	33.33	15.9	32.42	.879
8	Canadiens	29.1	1979-80	80	47	20	13		107	.669			328	240	88	81.4	31.64	13.0	27.69	.892
9	Rangers	28.8	1977-78	80	30	37	13		73	.456			279	280	-1	80.2	28.14	12.4	31.38	.888
10	Lightning	28.6	2023-24	82	45	29		8	98	.598	3	1	288	267	21	83.3	29.29	12.0	29.63	.890
11	Flames	28.5	1987-88	80	48	23	9		105	.656			397	305	92	80.4	33.33	14.9	29.65	.871
12	Canadiens	28.3	1978-79	80	52	17	11		115	.719			337	204	133	83.6	32.16	13.1	25.41	.900
13	Lightning	28.2	2018-19	82	62	16		4	128	.780	6	1	319	221	98	85.0	31.95	12.2	32.11	.916
14	Islanders	27.8	1981-82	80	54	16	10		118	.738			385	250	135	79.9	30.86	15.6	30.08	.896
15	Flames	27.7	1989-90	80	42	23	15		99	.619			348	265	83	79.2	34.35	12.7	25.34	.869
16	Oilers	27.6	2020-21	56	35	19		2	72	.643	0	0	183	154	29	82.5	29.89	10.9	30.66	.910
17	Maple Leafs	27.3	2021-22	82	54	21		7	115	.701	3	1	312	252	60	82.1	34.57	11.0	30.62	.900
18	Black Hawks	27.1	1982-83	80	47	23	10		104	.650			338	268	70	76.4	31.80	13.3	31.08	.892
19	Flames	27.1	1980-81	80	39	27	14		92	.575			329	298	31	80.6	27.13	15.2	33.16	.888
20	Canucks	27.0	1982-83	80	30	35	15		75	.469			303	309	-6	80.3	30.14	12.6	30.80	.875
21	Flyers	27.0	1980-81	80	41	24	15		97	.606			313	249	64	80.2	33.09	11.8	28.99	.893
22	Blues	27.0	2021-22	82	49	22		11	109	.665	2	3	309	239	70	84.1	30.39	12.4	31.60	.908
23	Hurricanes	26.9	2023-24	82	52	23		7	111	.677	2	5	277	211	66	86.4	33.33	10.1	25.62	.900
24	North Stars	26.8	1983-84	80	39	31	10		88	.550			345	344	1	77.9	31.68	13.6	32.63	.868
25	Capitals	26.8	2012-13	48	27	18		3	57	.594	3	0	146	130	16	77.9	28.13	10.8	32.31	.916