best defensive box plus minus per game ever in a season by a player with at least 50 gms

Bobby Orr has the highest +/- per game played with 50+ games played in a season, with 1.59 in 1970-71.

	NAME	+/-/GP	GP	+/-	SEASON	TM	G	A	P	PIM	PPG	PPA	SHG	SHA	GWG	OTG	S	S%
1	Bobby Orr B. Orr	1.59	78	+124	1970-71	BOS	37	102	139	91	5	44	3	10	5		392	9.4
2	Larry Robinson L. Robinson	1.56	77	+120	1976-77	MTL	19	66	85	45	3	15	0	0	3		196	9.7
3	Dallas Smith D. Smith	1.34	73	+98	1970-71	BOS	7	38	45	68	0	1	2	4	1		159	4.4
4	Jacques Laperriere J. Laperriere	1.33	58	+77	1972-73	MTL	7	16	23	34	2	1	0	1	0		89	7.9
5	Wayne Gretzky W. Gretzky	1.25	80	+100	1984-85	EDM	73	135	208	52	8	36	11	7	7	0	354	20.6
6	Bobby Orr B. Orr	1.14	74	+84	1973-74	BOS	32	90	122	82	11	24	0	4	4		384	8.3
7	Mark Howe M. Howe	1.13	77	+87	1985-86	PHI	24	58	82	36	4	19	7	3	3	0	193	12.4
8	Guy Lafleur G. Lafleur	1.11	80	+89	1976-77	MTL	56	80	136	20	14	18	0	0	8		290	19.3
9	Steve Shutt S. Shutt	1.11	80	+89	1976-77	MTL	60	45	105	28	8	10	0	0	9		293	20.5
10	Bobby Clarke B. Clarke	1.09	76	+83	1975-76	PHI	30	89	119	136	10	28	4	2	2		194	15.5
11	Bobby Orr B. Orr	1.09	76	+83	1971-72	BOS	37	80	117	106	11	24	4	5	4		353	10.5
12	Brad McCrimmon B. McCrimmon	1.08	80	+86	1985-86	PHI	13	43	56	85	2	13	0	3	2	0	167	7.8
13	Jari Kurri J. Kurri	1.07	73	+78	1984-85	EDM	71	64	135	30	14	14	3	3	13	0	267	26.6
14	Wayne Gretzky W. Gretzky	1.05	74	+78	1983-84	EDM	87	118	205	39	20	27	12	11	11	0	326	26.7
15	Brian Engblom B. Engblom	1.03	76	+78	1981-82	MTL	4	29	33	76	1	7	0	2	0		109	3.7
16	Lou Fontinato L. Fontinato	1.02	54	+55	1961-62	MTL	2	13	15	167	0	0	0	1	0		63	3.2
17	Serge Savard S. Savard	1.01	78	+79	1976-77	MTL	9	33	42	35	0	5	0	0	1		118	7.6
18	Bryan Trottier B. Trottier	1	68	+68	1983-84	NYI	40	71	111	59	7	16	3	2	4	0	194	20.6
19	Wayne Gretzky W. Gretzky	1	80	+80	1981-82	EDM	92	120	212	26	18	39	6	2	12		370	24.9
20	Rod Langway R. Langway	1	66	+66	1981-82	MTL	5	34	39	116	1	3	0	1	1		139	3.6
21	Bryan Trottier B. Trottier	1	76	+76	1978-79	NYI	47	87	134	50	15	29	0	0	8		187	25.1
22	Bobby Orr B. Orr	1	80	+80	1974-75	BOS	46	89	135	101	16	36	2	2	4		384	12.0
23	Bobby Clarke B. Clarke	0.99	80	+79	1974-75	PHI	27	89	116	125	10	24	3	2	4		195	13.8
24	Denis Potvin D. Potvin	0.97	73	+71	1978-79	NYI	31	70	101	58	12	30	3	1	2		237	13.1
25	Mike Bossy M. Bossy	0.97	67	+65	1983-84	NYI	51	67	118	8	6	22	0	0	11	0	246	20.7