In what 30 year period did the greatest drop in th number of Chinese ship occur?

The greatest drop in the number of Chinese ships occurred during the 1950s to the 1980s, particularly influenced by political and economic turmoil, including the Great Leap Forward and the Cultural Revolution. This period saw significant disruptions in shipbuilding and maritime activities, leading to a decline in the fleet size. By the late 1980s, efforts to modernize the industry began, reversing some of the previous declines.