It jumped 0.8 percent last month following a 0.4 percent rise in May, marking its largest gain since October 1999.

The amount of available capacity used by the industrial sector also rose for the sixth straight month, rising to 76.1 percent in June from 75.6 percent in May, its highest level since August of last year.

Factory production rose by 0.7 percent last month, following a 0.5 percent rise in May.