The deteriorating outlook on the mainland sent Japan’s Nikkei 225 stock average slumping 7.3 per cent, registering the deepest loss since the 2011 earthquake and tsunami. The Hang Seng Index dropped 2.54 per cent to 22,669.68, its biggest slide in seven weeks. The Shanghai Composite Index fell 1.16 per cent while Australia’s S&P/ASX 200 Index dropped 1.99 per cent.