Accountancy firm Deloitte Touche Tohmatsu expects China to become its largest market in terms of staff numbers and revenues over the next 20 years, the Wall Street Journal reported. "I think if you project ahead a couple of decades, I do believe the Chinese member firms will overtake the size and scale of the US member firms… in terms of revenue and head count," Deloitte CEO William Parrett said. The company's China, Hong Kong and Macau operation is currently its seventh-largest regional business by revenue and has 6,500 employees. Parrett expects worker numbers to rise to 10,000 by 2010, making China second only to the US, which has around 40,000 employees at present. Deloitte's China revenue is set to increase more than 40% for the fiscal year ending May 31, Parrett said. With half of a total pot of US$150 million already invested in China, he added that Deloitte could one day be referred to as a Chinese firm.