The Montreal Canadiens had their best power-play percentage in a season in 1977-78, at 31.9 percent.

when did the canadiens 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
Montreal Canadiens	31.9	1977-78	80	59	10	11		129	.806	359	183	81.0	32.76	25.94
Montreal Canadiens	29.1	1979-80	80	47	20	13		107	.669	328	240	81.4	31.64	27.69
Montreal Canadiens	28.3	1978-79	80	52	17	11		115	.719	337	204	83.6	32.16	25.41
Montreal Canadiens	25.2	1985-86	80	40	33	7		87	.544	330	280	79.4	29.43	27.11
Montreal Canadiens	24.2	1981-82	80	46	17	17		109	.681	360	223	80.1	33.78	27.48
Montreal Canadiens	24.1	1980-81	80	45	22	13		103	.644	332	232	81.7	33.86	26.44
Montreal Canadiens	24.1	2007-08	82	47	25		10	104	.634	257	216	82.5	29.06	31.57
Montreal Canadiens	24.0	1984-85	80	41	27	12		94	.588	309	262	79.2	30.20	24.65
Montreal Canadiens	22.8	2006-07	82	42	34		6	90	.549	239	251	83.5	29.59	32.74
Montreal Canadiens	22.7	1982-83	80	42	24	14		98	.613	350	286	74.4	32.88	29.09
Montreal Canadiens	21.8	2009-10	82	39	33		10	88	.537	210	218	83.0	28.61	32.12
Montreal Canadiens	21.2	2017-18	82	29	40		13	71	.433	207	258	74.1	32.77	32.32
Montreal Canadiens	21.0	1986-87	80	41	29	10		92	.575	277	241	83.3	28.00	27.13
Montreal Canadiens	21.0	1988-89	80	53	18	9		115	.719	315	218	82.2	30.85	26.54
Montreal Canadiens	20.7	2012-13	48	29	14		5	63	.656	146	124	79.8	30.58	26.94
Montreal Canadiens	20.1	1993-94	84	41	29	14		96	.571	283	248	82.6	31.20	30.15
Montreal Canadiens	20.1	1983-84	80	35	40	5		75	.469	286	295	79.7	28.65	25.70
Montreal Canadiens	19.7	2010-11	82	44	30		8	96	.585	213	206	84.4	31.73	30.95
Montreal Canadiens	19.7	2016-17	82	47	26		9	103	.628	223	198	81.1	29.99	29.62
Montreal Canadiens	19.5	1991-92	80	41	28	11		93	.581	267	207	81.3	30.54	27.84
Montreal Canadiens	19.3	2008-09	82	41	30		11	93	.567	242	240	82.4	30.01	31.71
Montreal Canadiens	19.2	2005-06	82	42	31		9	93	.567	241	244	81.1	30.12	30.57
Montreal Canadiens	19.2	2020-21	56	24	21		11	59	.527	158	165	78.5	31.18	28.20
Montreal Canadiens	19.0	1995-96	82	40	32	10		90	.549	265	248	82.2	28.82	32.39
Montreal Canadiens	18.5	1990-91	80	39	30	11		89	.556	273	249	80.9	29.81	28.95