For Turkmenistan, China trade reached 21 percent of GDP in 2011, up from 1 percent five years earlier, according to an Associated Press analysis of International Monetary Fund data.

NPR: Eyeing Rich Bounty, China In Line For Afghan Role

Its performance charts and portfolio data can be combined with fund-flow analysis and liquidity screens to rate ETFs in a number of different ways.

WSJ: Best Websites for Screening ETFs