SILVER SPRING, Md. — Growth in U.S. manufacturing slowed slightly in June, as supply chain problems persist and businesses say they are struggling to find workers.

The Institute for Supply Management, a trade group of purchasing managers, said today that its index of manufacturing activity ticked down in June to a reading of 60.6 from 61.2 in May.

Any reading above 50 indicates manufacturing is expanding. June was the 13th consecutive month manufacturing has grown after contracting in April 2020, when coronavirus fears triggered business shutdowns across the country.