The given line chart depicts how the average time the four car companies took to manufacture transportation in America changed over seven years, commencing from 1998.
Looking at an overall perspective, there was a decrease in the average time of four factories, with the most dramatic fall being seen in the figure for General Motor. Noticeably, the figure for Ford saw the most significant change among all categories.
In the beginning year of the period, General Motor and Ford recorded the highest number with 32 and 28 hours, respectively. Over the next three years, there was a remarkable increase in the figure of the average time of Ford to 31 hours in 2001, followed by a sharp fall to nearly 22 hours in 2005. Meanwhile, throughout the 7-year period, the figure for General Motor experienced a steep decline to 22 hours.
Turning to the statistics for Toyota and Honda, they came in third and fourth place in 1998, with approximately 22 hours. In the next four years, they witnessed a fluctuating change and then rose to nearly 24 hours in 2002. From 2002 to 2005, both factories experienced a moderate fall to 20 hours, making them stay unchanged in the overall order of the four companies.