United States of America - Knowledge economy index (0 = lowest & 10 = highest)

8.77 (index) in 2012

In 2012, knowledge economy index for United States of America was 8.77 index. Knowledge economy index of United States of America fell gradually from 9.53 index in 1995 to 8.77 index in 2012.

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What is United States of America knowledge economy index?