sentences:  Kaga Domain, which sold about 70,000 "koku" of rice every year in Osaka, succeeded in sending 100 "koku" by boat through this route in 1639.The Tokugawa shogunate also received rice from Dewa Province through merchant Kawamura Zuiken in 1672, but it is thought to be a response from these ships.Japanese ships at the time normally could make only one trip per year, but with the arrival of Western schooners in the Meiji era, ships were able to make up to four trips annually.