Chicago PMI index 55.9 in July vs 52.5 in June Thursday July 31, 10:05 am ET NEW YORK, July 31 (Reuters) - The National Association of Purchasing Management-Chicago said on Thursday its index of Midwest manufacturing activity came in at 55.9 in July, up from 52.5 in June and above analyst expectations of 54.0. The reading remained above the critical threshold of 50, which separates growth from contraction in the sector. . July June May Apr Mar Feb Jan Dec (seasonal adj) NAPM-Chicago 55.9 52.5 52.2 47.6 48.4 54.9 56.0 51.7 Production* 58.4 56.5 60.5 51.0 49.1 62.4 63.1 52.6...