Innovation System Index - The index value falls on a scale of 0-10 and is calculated from three key indicators: Total royalty payments and receipts in US$ per person, number of patent applications granted by the US Patent and Trademark Office per million people, and the number of scientific and technical journal articles published per million people. The top 10 percent of states score in the range 9-10, the next highest 10 per cent of states score in the range 8-9 and so on. HDI - Calculated based on data from UNDESA (2009d), Barro and Lee (2010), UNESCO Institute for Statistics (2010a), World Bank (2010g) and IMF (2010a).