Germany’s economic growth slumped to a six-year low in 2019 as the export powerhouse faced challenges in its flagship car industry, persistently slowing Chinese growth and global trade conflicts, a slowdown that weighs on Europe’s outlook. Germany, Europe’s largest economy, is the first major country to report full-year growth figures for 2019 after the World Bank last week estimated that the global economy expanded by just 2.4% last year, the weakest rate since the global financial crisis. The bank also lowered…