The given line gragh illustrtes how much time is needed to make a vehicle by four specific companies in US from 1998 to 2005.
In summary, General motor and Ford spent more time than Toyota and Honda to manufacture a car generally over the years. Although all four companies witnessed a downward trend through the studies, it was much more sharply for General motor and Ford.
In 1998, General motor spent 32 hours on manufacturing a vehicle, which was the most amount of time among all. Ford with consuming 28 hours was the second one, while making a new car took both Toyota and Honda only 22 hours.
Over the years, although three of them had shown a moderate increase to consume time to manufacture a vehicle by 2002, Toyota and Honda fell moderately in following studies, with 20 hours in the last survey and, Ford had a noticeable decline to about 21 hours in the same study. Whereas General motor decreased steadily the hours they needed to manufacture a car and, it reached 22 hours in 2005.