It should come as no surprise but it is still shocking. The world GDP growth is primarily driven by two countries. According to a recent article in the Economist (Sept. 17th issue), the world economy grew by 2.7% in Q2 of 2016 compared with the year before. China grew at 6.7% and India at 7.1% Together, these two large economies counter for 63% of the global growth. Considering their links to other emerging markets, how they influence demand, commodity prices, and trade in other countries, their broader impact is a lot more than the simple 63% weighted average pull.
World Bank GDP data for download.