How many switch hitters are there in currently in MLB that are 31 years old?

	NAME	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	OBP	SLG	OPS
1	Nick Altrock N. Altrock	22	49	6	10	2	0	0	3	3	2	8	1	55	12	2	1	.204	.278	.245	.523
2	Mordecai Brown M. Brown	47	121	5	25	0	0	0		3	0	20	2	129	25	0	5	.207	.226	.207	.432
3	Sammy Strang S. Strang	28	53	8	5	0	0	0		22	2	5	5	79	5	0	2	.094	.377	.094	.471
4	Miller Huggins M. Huggins	60	159	18	34	3	1	0		28	1		11	196	39	4	8	.214	.335	.245	.580
5	Walt Slagle W. Slagle	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
6	Jimmy Austin J. Austin	148	543	84	141	25	11	2		68	6		26	652	194	38	35	.260	.348	.357	.706
7	Bill Burns B. Burns	27	47	3	9	0	1	0		3	0	16	0	50	11	1	0	.191	.240	.234	.474
8	Boss Schmidt B. Schmidt	2	9	1	2	0	0	0		0	0		0	9	2	0	0	.222	.222	.222	.444
9	Red Ames R. Ames	45	89	6	11	0	0	1		2	0	31	1	93	14	1	2	.124	.143	.157	.300
10	Bill Collins B. Collins	32	95	8	18	1	0	0	5	8	2	11	2	107	19	1	2	.189	.267	.200	.467
11	Ivan Howard I. Howard	82	210	21	51	6	2	0		27	3	42	14	248	61	8	8	.243	.338	.290	.628
12	Jimmie Savage J. Savage	46	147	23	39	2	2	1	9	22	0		4	175	48	5	6	.265	.361	.327	.687
13	Jack Coombs J. Coombs	5	11	0	3	1	0	0	2	1	0	1	0	12	4	1	0	.273	.333	.364	.697
14	Tom Downey T. Downey	92	281	24	56	9	1	1	19	26	1		11	314	70	11	6	.199	.269	.249	.519
15	Bob Bescher B. Bescher	130	486	71	128	15	7	4		52	7	53	27	560	169	26	15	.263	.343	.348	.691
16	Eddie Cicotte E. Cicotte	35	54	6	9	0	0	0		7	1	11	0	73	9	0	11	.167	.274	.167	.441
17	Danny Moeller D. Moeller	103	271	35	61	8	1	1		36	2	41	15	316	74	10	7	.225	.320	.273	.593
18	Harry Coveleski H. Coveleski	15	22	2	5	0	0	0	0	0	0	5	0	23	5	0	1	.227	.227	.227	.455
19	Bill McKechnie B. McKechnie	120	405	38	103	14	8	2		28	1	26	10	446	139	24	12	.254	.304	.343	.647
20	Rube Marquard R. Marquard	34	76	0	13	2	0	0		2	1	14	0	80	15	2	1	.171	.203	.197	.400
21	Bill James B. James	19	46	0	5	1	0	0	1	1	0	12	0	47	6	1	0	.109	.128	.130	.258
22	Hippo Vaughn H. Vaughn	38	98	5	17	4	0	0		8	0	27	0	107	21	4	1	.173	.236	.214	.450
23	Donie Bush D. Bush	129	508	82	124	11	6	0		76	2	36	22	601	147	17	15	.244	.345	.289	.634
24	Red Faber R. Faber	34	89	9	10	1	0	0	0	15	0	35	1	110	11	1	6	.112	.240	.124	.364
25	Wally Schang W. Schang	138	448	68	131	32	6	4	50	73	9	37	4	538	187	42	8	.292	.402	.417	.819