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The China International Import Expo has been running for five years, bringing a lot of new foreign brands into the Chinese market. A total of 284 of the world's top 500 companies and industry leaders will take part in the Business Exhibition this year. The number is more than last year and 90 percent of them have participated in the expo before. But how has the consumer market been changing in China over the past five years? And why do foreign brands keep coming?