What is the monthly consumption of photographic background paper in China at present?

This problem should not be counted in China now, but the sales volume of background paper in China is far from that in foreign countries, because foreigners have different consumption concepts from ours. In China, a background can be used for 2 years, even 3 years and 5 years, and it is still used after fading! But in foreign countries, it is only changed once every six months, no more than one year at most! Sky blue, white, gray and black are the most commonly used in China!