The Organisation for Economic Co-operation and Development on Thursday slightly lowered its projections for global economic growth this year and next, saying the expansion "may have now peaked."

The world's gross domestic product is expected to expand a real 3.7 percent in 2018, down from the 3.8 percent forecast in May, the OECD said in its interim economic outlook report. GDP is seen expanding 3.7 percent in 2019, rather than the previous estimate of 3.9 percent.

"Growth has become less broad-based, with prospects diverging across the major economies, especially among the emerging market economies," the Paris-based organization said.