The U.S. Share of Global R&D has declined. In 1995, the United States accounted for 38.3 percent of global R&D. As of 2016, the U.S. share had declined to 28.5 percent.This decline is partly due to increasing investments from smaller nations such as Spain, Ireland, Israel, and Norway. But the biggest drivers behind the declining U.S. share of R&D are greater investments by Taiwan, South Korea, and China.