Crude oil prices declined heavily in early trading Monday after OPEC data show the dynamics of global supply and demand remain unchanged. For nearly two years, crude oil markets have been pressured by global economic growth that was too slow to take up the heavy supply of energy products. By May, the International Energy Agency said some level of balance was returning to the market as supplies where fading against slow increase in overall demand. Crude oil prices are up 7 percent from May and 90 percent higher than their low point for the year as the glut of oil that persisted on the market for the last two years starts to fade. […]