highest woba by a first baseman in a season with at least 500 pa since 1990

Since 1990, Frank Thomas has the best wOBA by a first baseman with 500+ plate appearances in a season, with a wOBA of .499 in 1994.

	NAME	WOBA	PA	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WRC+	BRAA
1	Frank Thomas F. Thomas	.499	517	1994	CWS	113	399	106	141	34	1	38	101	109	2	61	2	3	291	73	0	7	12	15	.353	.487	.729	1.217	138	72.3	205	71.9
2	Mark McGwire M. McGwire	.492	681	1998	STL	155	509	130	152	21	0	70	147	162	6	155	1	0	383	91	0	4	28	8	.299	.470	.752	1.222	176	91.7	205	90.7
3	Mark McGwire M. McGwire	.489	548	1996	OAK	130	423	104	132	21	0	52	113	116	8	112	0	0	309	73	0	1	16	14	.312	.467	.730	1.198	142	71.8	190	68.5
4	Todd Helton T. Helton	.476	697	2000	COL	160	580	138	216	59	2	42	147	103	4	61	5	3	405	103	0	10	22	12	.372	.463	.698	1.162	174	82.4	161	58
5	Carlos Delgado C. Delgado	.471	711	2000	TOR	162	569	115	196	57	1	41	137	123	15	104	0	1	378	99	0	4	18	12	.344	.470	.664	1.134	174	81	179	76
6	Jason Giambi J. Giambi	.471	664	2000	OAK	152	510	108	170	29	1	43	137	137	9	96	2	0	330	73	0	8	6	9	.333	.476	.647	1.123	163	75.5	182	74.3
7	Jason Giambi J. Giambi	.465	671	2001	OAK	154	520	109	178	47	2	38	120	129	13	83	2	0	343	87	0	9	24	17	.342	.477	.660	1.137	162	78.3	193	78.7
8	Jim Thome J. Thome	.461	613	2002	CLE	147	480	101	146	19	2	52	118	122	5	139	1	2	325	73	0	6	18	5	.304	.445	.677	1.122	142	68.3	189	67.1
9	Albert Pujols A. Pujols	.459	641	2008	STL	148	524	100	187	44	0	37	116	104	5	54	7	3	342	81	0	8	34	16	.357	.462	.653	1.114	146	69.1	185	68.1
10	Todd Helton T. Helton	.457	696	2001	COL	159	587	132	197	54	2	49	146	98	5	104	7	5	402	105	1	5	15	14	.336	.432	.685	1.116	163	76.6	160	54.8
11	Frank Thomas F. Thomas	.454	649	1997	CWS	146	530	110	184	35	0	35	125	109	3	69	1	1	324	70	0	7	9	15	.347	.456	.611	1.067	146	66	179	65.5
12	John Olerud J. Olerud	.454	679	1993	TOR	158	551	109	200	54	2	24	107	114	7	65	0	2	330	80	0	7	33	12	.363	.473	.599	1.072	151	69.8	180	66.6
13	Todd Helton T. Helton	.454	683	2004	COL	154	547	115	190	49	2	32	96	127	3	72	3	0	339	83	0	6	19	12	.347	.469	.620	1.088	156	71.6	166	58.1
14	Mark McGwire M. McGwire	.453	661	1999	STL	153	521	118	145	21	1	65	147	133	2	141	0	0	363	87	0	5	21	12	.278	.424	.697	1.120	150	64.2	169	61.5
15	Todd Helton T. Helton	.453	703	2003	COL	160	583	135	209	49	5	33	117	111	2	72	0	4	367	87	0	7	21	19	.358	.458	.630	1.088	160	73.6	163	56.6
16	Frank Thomas F. Thomas	.451	649	1996	CWS	141	527	110	184	26	0	40	134	109	5	70	1	1	330	66	0	8	26	25	.349	.459	.626	1.085	148	64.3	167	60.4
17	Albert Pujols A. Pujols	.447	700	2009	STL	160	568	124	186	45	1	47	135	115	9	64	16	4	374	93	0	8	44	23	.327	.443	.658	1.101	152	68.5	180	68.8
18	Albert Pujols A. Pujols	.447	634	2006	STL	143	535	119	177	33	1	49	137	92	4	50	7	2	359	83	0	3	28	20	.331	.431	.671	1.102	142	62.6	174	61.7
19	Derrek Lee D. Lee	.444	691	2005	CHC	158	594	120	199	50	3	46	107	85	5	109	15	3	393	99	0	7	23	12	.335	.418	.662	1.080	150	67.4	170	60.9
20	Jeff Bagwell J. Bagwell	.442	729	1999	HOU	162	562	143	171	35	0	42	126	149	11	127	30	11	332	77	0	7	16	18	.304	.454	.591	1.045	159	63.9	166	65.7
21	Albert Pujols A. Pujols	.442	692	2004	STL	154	592	133	196	51	2	46	123	84	7	52	5	5	389	99	0	9	12	21	.331	.415	.657	1.072	151	65.3	171	63.6
22	Frank Thomas F. Thomas	.441	647	1995	CWS	145	493	102	152	27	0	40	111	136	6	74	3	2	299	67	0	12	29	14	.308	.454	.606	1.061	139	58.3	168	57.8
23	Jason Giambi J. Giambi	.440	689	2002	NYY	155	560	120	176	34	1	41	122	109	15	112	2	2	335	76	0	5	4	18	.314	.435	.598	1.034	148	64.8	175	63.6
24	Joey Votto J. Votto	.438	648	2010	CIN	150	547	106	177	36	2	37	113	91	7	125	16	5	328	75	0	3	8	11	.324	.424	.600	1.024	135	60.6	172	55.8
25	Miguel Cabrera M. Cabrera	.437	688	2011	DET	161	572	111	197	48	0	30	105	108	3	89	2	1	335	78	0	5	22	24	.344	.448	.586	1.033	143	66.1	177	61.8