BEIJING—Global stock markets declined Friday ahead of U.S. inflation data that might influence a Federal Reserve decision on when to roll back economic stimulus. London and Frankfurt opened lower. Shanghai, Tokyo, and Hong Kong retreated. Fed officials, due to meet next week, have said plans to wind down bond purchases and other stimulus that is boosting stock prices might be accelerated if necessary to cool inflation that hit a 30-year high in October. Traders were “potentially taking some risks off the table” while they wait for November consumer price data, said Yeap Jun Rong of IG in a report. In early trading, the FTSE 100 in London lost 0.3 percent to 7,302.55 and Frankfurt’s DAX shed 0.4 percent to 15,576.18. The CAC 40 in Paris declined 0.6 percent to 6,969.04. On Wall Street, the future for the benchmark S&P 500 was 0.1 percent higher. That for the Dow Jones Industrial …