At what amount of output does labor change from exhibiting increasing returns to decreasing returns?

Q	Q2	AVC	ATC	TC	MC
1	1	43.34	903.34	903.34	40.93
2	4	41.06	450.53	901.06	36.76
3	9	39.04	299.68	899.04	33.37
4	16	37.28	224.32	897.28	30.76
5	25	35.78	179.16	895.78	28.93
6	36	34.54	149.09	894.54	27.88
7	49	33.56	127.65	893.56	27.61
8	64	32.84	111.61	892.84	28.12
9	81	32.38	99.15	892.38	29.41
10	100	32.18	89.22	892.18	31.48
11	121	32.24	81.11	892.24	34.33
12	144	32.56	74.38	892.56	37.96
13	169	33.14	68.70	893.14	42.37
14	196	33.98	63.86	893.98	47.56
15	225	35.08	59.67	895.08	53.53
16	256	36.44	56.03	896.44	60.28
17	289	38.06	52.83	898.06	67.81
18	324	39.94	50.00	899.94	76.12
19	361	42.08	47.48	902.08	85.21
20	400	44.48	45.22	904.48	95.08
21	441	47.14	43.20	907.14	105.73
22	484	50.06	41.37	910.06	117.16
23	529	53.24	39.71	913.24	129.37
24	576	56.68	38.20	916.68	142.36
25	625	60.38	36.82	920.38	156.13