how many different players with at least 50 homeruns in a season

Babe Ruth homered 54 times in 1920.

	NAME	HR	SEASON	TM	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Babe Ruth B. Ruth	54	1920	NYY	142	458	158	172	36	9	135	150	3	80	14	14	616	388	99	5				.376	.532	.847	1.379	191	120.9	.597	237	110.5
2	Babe Ruth B. Ruth	59	1921	NYY	152	540	177	204	44	16	168	145	4	81	17	13	693	457	119	4				.378	.512	.846	1.359	214	127.8	.575	224	118.7
3	Babe Ruth B. Ruth	60	1927	NYY	151	540	158	192	29	8	165	137	0	89	7	6	691	417	97	14				.356	.486	.772	1.258	195	109.9	.545	212	104.8
4	Babe Ruth B. Ruth	54	1928	NYY	154	536	163	173	29	8	146	137	3	87	4	5	684	380	91	8				.323	.463	.709	1.172	174	90.6	.510	201	89.3
5	Hack Wilson H. Wilson	56	1930	CHC	155	585	146	208	35	6	191	105	1	84	3		709	423	97	18				.356	.454	.723	1.177	189	89	.497	171	78.9
6	Jimmie Foxx J. Foxx	58	1932	PHA	154	585	151	213	33	9	169	116	0	96	3	7	701	438	100	0				.364	.469	.749	1.218	193	105.6	.522	198	95.8
7	Jimmie Foxx J. Foxx	50	1938	BSA	149	565	139	197	33	9	175	119	0	76	5	4	685	398	92	1				.349	.462	.704	1.166	178	91.7	.508	173	74.2
8	Hank Greenberg H. Greenberg	58	1938	DET	155	556	143	175	23	4	147	119	3	92	7	5	681	380	85	3				.315	.438	.683	1.122	166	80.3	.489	162	62
9	Ralph Kiner R. Kiner	51	1947	PIT	152	565	118	177	23	4	127	98	2	81	1		666	361	78	1			12	.313	.417	.639	1.055	145	69.5	.472	169	58.2
10	Johnny Mize J. Mize	51	1947	NYG	154	586	137	177	26	2	138	74	4	42	2		664	360	79	0			6	.302	.384	.614	.998	132	57.1	.448	156	47.4
11	Ralph Kiner R. Kiner	54	1949	PIT	152	549	116	170	19	5	127	117	1	61	6		667	361	78	0			10	.310	.432	.658	1.089	153	73.4	.484	179	65.8
12	Willie Mays W. Mays	51	1955	NYG	152	580	123	185	18	13	127	79	4	60	24	4	670	382	82	0	7	13	12	.319	.400	.659	1.059	143	65.3	.450	171	59.7
13	Mickey Mantle M. Mantle	52	1956	NYY	150	533	132	188	22	5	130	112	2	99	10	1	652	376	79	1	4	6	4	.353	.464	.705	1.169	164	88.9	.498	202	84.6
14	Mickey Mantle M. Mantle	54	1961	NYY	153	514	131	163	16	6	128	126	0	112	12	1	646	353	76	1	5	9	2	.317	.448	.687	1.135	156	79.6	.478	197	78.8
15	Roger Maris R. Maris	61	1961	NYY	161	590	132	159	16	4	141	94	7	67	0	0	698	366	81	0	7	0	16	.269	.372	.620	.993	138	55.9	.424	162	55.1
16	Willie Mays W. Mays	52	1965	SFG	157	558	118	177	21	3	112	76	0	71	9	4	638	360	76	2	2	16	11	.317	.398	.645	1.043	136	68.2	.448	186	62.7
17	George Foster G. Foster	52	1977	CIN	158	615	124	197	31	2	149	61	5	107	6	4	689	388	85	0	8	10	17	.320	.382	.631	1.013	139	58.4	.430	165	54.1
18	Cecil Fielder C. Fielder	51	1990	DET	159	573	104	159	25	1	132	90	5	182	0	1	673	339	77	0	5	11	15	.277	.377	.592	.969	127	51.8	.419	165	50.2
19	Albert Belle A. Belle	50	1995	CLE	143	546	121	173	52	1	126	73	6	80	5	2	629	377	103	0	4	5	24	.317	.401	.690	1.091	143	64.3	.456	173	59.9
20	Brady Anderson B. Anderson	50	1996	BAL	149	579	117	172	37	5	110	76	22	106	21	8	687	369	92	6	4	1	11	.297	.396	.637	1.034	147	58	.434	155	52.1
21	Mark McGwire M. McGwire	52	1996	OAK	130	423	104	132	21	0	113	116	8	112	0	0	548	309	73	0	1	16	14	.312	.467	.730	1.198	142	71.8	.489	190	68.5
22	Ken Griffey Jr. K. Griffey Jr.	56	1997	SEA	157	608	125	185	34	3	147	76	8	121	15	4	704	393	93	0	12	23	12	.304	.382	.646	1.028	139	52.2	.421	155	49
23	Mark McGwire M. McGwire	58	1997	TOT	156	540	86	148	27	0	123	101	9	159	3	0	657	349	85	0	7	16	9	.274	.393	.646	1.039	134	52.9	.429	161	51.4
24	Ken Griffey Jr. K. Griffey Jr.	56	1998	SEA	161	633	120	180	33	3	146	76	7	121	20	5	720	387	92	0	4	11	14	.284	.365	.611	.977	135	46	.408	145	41.8
25	Mark McGwire M. McGwire	70	1998	STL	155	509	130	152	21	0	147	162	6	155	1	0	681	383	91	0	4	28	8	.299	.470	.752	1.222	176	91.7	.492	205	90.7