Russia's economy minister on Tuesday downgraded the annual economic growth forecast to 1.4 from 1.8 percent due to weak investment, and warned that expansion would be slower than expected through 2015 "Our fourth-quarter growth rate will probably be 1.4 percent, with a very small likelihood (of it reaching) 1.5 percent," the state RIA Novosti news agency quoted Economy Minister Alexei Ulukyayev as saying.