sentences:  Even so, the Japanese in the "Nihonmachi" of Hội An exerted a powerful influence upon the affairs of the trading port, the Japanese demand for silk being so great that the comings and goings of Japanese merchant ships every year caused dramatic cyclical shifts in market prices.On average, more than ten Japanese ships visited the port every year during the period of the "red seal ships", that is, between roughly 1590 and 1635; this represented fully a quarter of all Japanese maritime economic activity, more than that of any other individual port.For several months every year, when the trade winds allowed Chinese and Japanese ships to arrive, a vibrant marketplace would appear in the port, and Chinese, Japanese, and Vietnamese merchants engaged in trading a wide variety of goods.