Turkmenistan's gross domestic product grew 6.7 percent in 2015, President Kurbanguly Berdymukhamedov was quoted as saying by state television on Saturday, a slowdown from 10.3 percent in 2014. The International Monetary Fund had forecast the Central Asian state's gross domestic product growth to slow to 8.5 percent last year on the back of declining natural gas export revenues and lower public investment.