How many pitchers have won mvp in a regular season?

Interpreted as:

	POSITION	W	MVP	SEASON	L	W%	G	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Pitcher	1,227	1	1931	1,227	.500	4,520	2,472	4.12	7,905	1,188	132	201	21976.1	24,026	10,065	11,884	1,069	7,657	370	1,281	96,192	346	3.24	3.14	1.03	0.44	8.2	8.0	1.44	.290	4.87	100	4.12	100	9.84	-5.1
2	Second Baseman	0	1	1931	0		4	0	5.02	3	0	0	0	14.1	13	8	8	0	12	0	3	65	1	1.88	7.53	0.25	0.00	4.6	18.5	1.74	.260	5.02	113	5.21	121	8.16	-1.4
3	First Baseman	0	1	1932	0		1	0	0.00	2	0	0	0	1.0	1	0	0	0	0	0	1	4	0	18.00	0.00		0.00	50.0	0.0	1.00	.500	0.00	0	-0.98	-25	9.00	0.6
4	Right Fielder		1	1932
5	Pitcher	1,215	1	1933	1,216	.500	4,592	2,451	3.81	7,443	1,111	166	223	21891.1	22,954	9,258	10,970	1,067	7,346	352	1,340	94,648	392	3.06	3.02	1.01	0.44	7.9	7.8	1.38	.279	4.51	100	3.81	100	9.44	-8.8
6	First Baseman		1	1933
7	Pitcher	1,215	1	1934	1,215	.500	4,784	2,445	4.28	8,422	1,060	137	238	21702.0	23,959	10,324	11,989	1,343	7,848	340	1,385	95,479	427	3.49	3.25	1.07	0.56	8.8	8.2	1.47	.292	4.97	100	4.28	100	9.94	-3.3
8	Catcher		1	1934
9	Catcher		1	1935
10	First Baseman		1	1935
11	Pitcher	1,228	1	1936	1,228	.500	4,780	2,476	4.52	8,230	1,075	118	235	22035.2	24,841	11,076	12,860	1,364	8,408	413	1,399	97,821	557	3.36	3.43	0.98	0.56	8.4	8.6	1.51	.296	5.25	100	4.52	100	10.15	24.6
12	First Baseman		1	1936
13	Second Baseman	0	1	1937	0		3	0	6.52	1	0	0	0	9.2	13	7	9	3	5	0	3	45	0	0.93	4.66	0.20	2.79	2.2	11.1	1.86	.278	8.38	134	8.42	177	12.10	-3.7
14	Left Fielder	0	1	1937	0		1	0	18.00	0	0	0	0	1.0	3	2	2	0	2	0	1	7	0	0.00	18.00	0.00	0.00	0.0	28.6	5.00	.600	18.00	456	9.04	224	27.00	-0.5
15	Catcher		1	1938
16	First Baseman		1	1938
17	Pitcher	1,221	1	1939	1,221	.500	4,834	2,462	4.26	8,514	1,027	128	255	21809.2	23,345	10,332	11,854	1,443	8,471	354	1,428	95,836	444	3.51	3.50	1.01	0.60	8.9	8.8	1.46	.284	4.89	100	4.26	100	9.63	-10.6
18	Center Fielder	0	1	1939	0		2	0	3.60	2	0	0	0	5.0	2	2	2	0	3	0	2	21	0	3.60	5.40	0.67	0.00	9.5	14.3	1.00	.125	3.60	92	3.97	97	3.60	0.1
19	First Baseman	0	1	1940	0		1	0	0.00	0	0	0	0	1.0	1	0	0	0	0	0	1	3	0	0.00	0.00		0.00	0.0	0.0	1.00	.333	0.00	0	2.84	72	9.00	0.1
20	Left Fielder	0	1	1940	0		1	0	4.50	1	0	0	0	2.0	3	1	1	0	0	0	1	9	0	4.50	0.00		0.00	11.1	0.0	1.50	.375	4.50	100	1.84	42	13.50	0.6
21	First Baseman		1	1941
22	Center Fielder		1	1941
23	Pitcher	1,214	1	1942	1,208	.501	4,600	2,443	3.48	8,310	1,126	177	198	21882.2	21,093	8,452	9,944	1,066	8,351	336	1,308	93,615	386	3.42	3.43	1.00	0.44	8.9	8.9	1.35	.265	4.09	100	3.48	100	8.68	2
24	Second Baseman		1	1942
25	Pitcher	1,227	1	1943	1,226	.500	4,645	2,476	3.33	8,558	1,095	196	253	22378.2	21,441	8,286	9,658	904	8,341	328	1,376	94,990	352	3.44	3.35	1.03	0.36	9.0	8.8	1.33	.267	3.88	100	3.34	100	8.62	-5.7