... measure, occupying five of the top eight slots. The top six, or top quintile, includes Denmark, Norway, and Iceland, as well as the Netherlands, Switzerland, and South Korea. The second quintile includes, ... business There are two clusters of rankings: those that tend to locate the U.S. in the mid-teens of the rankings, and those that locate the U.S. at the very top of the rankings. The most important ... appears that the United States opened the first decade of the 21st centuries in the top quintile in penetration and prices, and has been surpassed by other countries over the course of the decade....