China's economy appears to be weakening more rapidly than official statistics would suggest, raising fears of a painful slowdown that could be felt around the globe. Second-quarter gross domestic product statistics to be released this week are expected to show growth of around 7.5% compared with the same period last year, according to analysts' estimates. That would be the slowest pace since the depths of the global financial crisis. But government data are widely believed to understate the extent of China's woes.