A new study says Pennsylvania had among the highest percentages of teen employment last year compared with other states. However the jobless rate for young American workers overall is at its highest level since World War II. The report released Monday by the Annie E. Casey Foundation says about 39% of Pennsylvania teens age 16 to 19 held jobs in 2011. The national average was 26%. Among ages 20 to 24, Pennsylvania's 62% employment rate was about equal to the U.S. average. Experts say the weak economy has led to younger workers being squeezed out of entry-level jobs by older people with more experience. The "Kids Count" study says businesses, government officials, philanthropists and communities must collaborate to create more workforce opportunities for young adults.