highest obp in american league with a minimum 500 pa through age-by by 20 season since 1947

Since 1947, Ted Williams has the best on-base percentage in the AL with 500+ plate appearances in a season, with an on-base percentage of .526 in 1957.

Interpreted as:

highest obp in american league with a minimum 500 pa through age-by a player by 20 season since 1947

	NAME	OBP	PA	AGE	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Ted Williams T. Williams	.526	546	38	1957	BOS	132	420	96	163	28	1	38	87	119	5	43	0	1	307	67	0	2	33	11	.388	.731	1.257	148	87.3	.524	223	79
2	Ted Williams T. Williams	.513	526	35	1954	BOS	117	386	93	133	23	1	29	89	136	1	32	0	0	245	53	0	3		10	.345	.635	1.148	131	71.1	.507	207	65.5
3	Mickey Mantle M. Mantle	.512	623	25	1957	NYY	144	474	121	173	28	6	34	94	146	0	75	16	3	315	68	0	3	23	5	.365	.665	1.177	157	87.1	.498	217	86
4	Ted Williams T. Williams	.499	693	28	1947	BSA	156	528	125	181	40	9	32	114	162	2	47	0	1	335	81	1			10	.343	.634	1.133	170	91.3	.508	207	86.2
5	Ted Williams T. Williams	.497	638	29	1948	BSA	137	509	124	188	44	3	25	127	126	3	41	4	0	313	72	0			10	.369	.615	1.112	156	81	.504	184	68.8
6	Ted Williams T. Williams	.490	730	30	1949	BSA	155	566	150	194	39	3	43	159	162	2	48	1	1	368	85	0			22	.343	.650	1.141	182	95.5	.511	187	82.2
7	Frank Thomas F. Thomas	.487	517	26	1994	CWS	113	399	106	141	34	1	38	101	109	2	61	2	3	291	73	0	7	12	15	.353	.729	1.217	138	72.3	.499	205	71.9
8	Norm Cash N. Cash	.487	672	26	1961	DET	159	535	119	193	22	8	41	132	124	9	85	11	5	354	71	2	2	19	16	.361	.662	1.148	168	88.3	.488	194	79.5
9	Mickey Mantle M. Mantle	.486	502	30	1962	NYY	123	377	96	121	15	1	30	89	122	1	78	9	0	228	46	0	2	9	4	.321	.605	1.091	118	59.5	.472	192	57.6
10	Ted Williams T. Williams	.479	503	37	1956	BOS	136	400	71	138	28	2	24	82	102	1	39	0	0	242	54	0	0	11	13	.345	.605	1.084	116	57.5	.470	175	47.8
11	Edgar Martinez E. Martinez	.479	639	32	1995	SEA	145	511	121	182	52	0	29	113	116	8	87	4	3	321	81	0	4	19	11	.356	.628	1.107	152	72.5	.469	182	68.8
12	Jason Giambi J. Giambi	.477	671	30	2001	OAK	154	520	109	178	47	2	38	120	129	13	83	2	0	343	87	0	9	24	17	.342	.660	1.137	162	78.3	.465	193	78.7
13	Jason Giambi J. Giambi	.476	664	29	2000	OAK	152	510	108	170	29	1	43	137	137	9	96	2	0	330	73	0	8	6	9	.333	.647	1.123	163	75.5	.471	182	74.3
14	Wade Boggs W. Boggs	.476	719	30	1988	BOS	155	584	128	214	45	6	5	58	125	3	34	2	3	286	56	0	7	18	23	.366	.490	.965	141	62.7	.427	167	55.5
15	John Olerud J. Olerud	.473	679	24	1993	TOR	158	551	109	200	54	2	24	107	114	7	65	0	2	330	80	0	7	33	12	.363	.599	1.072	151	69.8	.454	180	66.6
16	Carlos Delgado C. Delgado	.470	711	28	2000	TOR	162	569	115	196	57	1	41	137	123	15	104	0	1	378	99	0	4	18	12	.344	.664	1.134	174	81	.471	179	76
17	Mark McGwire M. McGwire	.467	548	32	1996	OAK	130	423	104	132	21	0	52	113	116	8	112	0	0	309	73	0	1	16	14	.312	.730	1.198	142	71.8	.489	190	68.5
18	Mickey Mantle M. Mantle	.464	652	24	1956	NYY	150	533	132	188	22	5	52	130	112	2	99	10	1	376	79	1	4	6	4	.353	.705	1.169	164	88.9	.498	202	84.6
19	Edgar Martinez E. Martinez	.464	634	33	1996	SEA	139	499	121	163	52	2	26	103	123	8	84	3	3	297	80	0	4	12	15	.327	.595	1.059	144	62.2	.450	164	56
20	Ted Williams T. Williams	.464	675	32	1951	BSA	148	531	109	169	28	4	30	126	144	0	45	1	1	295	62	0			10	.318	.556	1.019	146	66.5	.463	166	55.4
21	Wade Boggs W. Boggs	.461	667	29	1987	BOS	147	551	108	200	40	6	24	89	105	2	48	1	3	324	70	1	8	19	13	.363	.588	1.049	147	64.9	.443	171	60.2
22	Mike Trout M. Trout	.460	607	26	2018	LAA	140	471	101	147	24	4	39	79	122	10	124	24	2	296	67	0	4	25	5	.312	.628	1.088	136	65.3	.447	189	64.4
23	Frank Thomas F. Thomas	.459	649	28	1996	CWS	141	527	110	184	26	0	40	134	109	5	70	1	1	330	66	0	8	26	25	.349	.626	1.085	148	64.3	.451	167	60.4
24	Ted Williams T. Williams	.458	517	39	1958	BOS	129	411	81	135	23	2	26	85	98	4	49	1	0	240	51	0	4	12	19	.328	.584	1.042	110	52.2	.449	179	47.5
25	Aaron Judge A. Judge	.458	703	32	2024	NYY	158	559	122	180	36	1	58	144	133	9	171	10	0	392	95	0	2	20	22	.322	.701	1.159	176	93.7	.476	219	95.5