The line graph illustrates the number of hours required to manufacture a vehicle by four US-based car companies between 1998 and 2002.
Overall, the production time decreased for most manufacturers during the period. Nissan recorded the most dramatic reduction and became the fastest producer by 2002, while Ford showed relatively stable figures with a slight increase. Daimler Chrysler consistently required more time than the other companies.
In 1998, Nissan had the highest production time at approximately 37 hours per vehicle. However, its figure dropped sharply to around 30 hours in 1999 and continued falling steadily to just 21 hours in 2002. Similarly, General Motors reduced its manufacturing time from 32 hours to about 24 hours over the five-year period, showing a gradual but consistent decline.
By contrast, Daimler Chrysler began at 34 hours in 1998 and decreased only moderately to 31 hours between 1999 and 2001 before reaching 28 hours in 2002. Ford, on the other hand, remained comparatively stable. Its production time stood at roughly 25 hours in both 1998 and 1999, rose slightly to 27 hours in 2001, and then fell marginally to 26 hours by the end of the period.
As a result, Nissan experienced the greatest improvement in efficiency, whereas Ford showed the least overall change.