About half of Chinese firms feel that the country's exchange rate reforms have affected their exports, according to a survey published Tuesday by the statistics bureau and the top economic planning agency.

When surveyed in June, 49.8 percent of companies said they had felt some impact on their exports from changes in the yuan's value, the National Bureau of Statistics and the National Development and Reform Commission said.

That was an increase from 47.5 percent when the companies were last surveyed in March, they said. About 85 percent of the firms are content with their level of export orders.

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