The line graph gives information on the production time required to build one vehicle by four US automobile companies in the years of 1998 and 2002. Overall, a general trend was to reduce assembly time for all companies, with the exception of Daimler Chrysler. Notably, Nissan was the most proficient company for most of the period.
Nissan spent the most time on its vehicle production in the initial year. Its production hours dropped from around 37 hours in 1998 to roughly 24 hours by 2000. The figure showed a slight decrease between 2000 and 2002 and reached around 21 hours, which made it the most efficient company at the end of the period.
General Motors showed a similar trend, but in a steadier way. The company reduced its manufacturing time from approximately 32 hours at the start to about 25 hours in 2002.
In comparison, the pattern for Daimler Chrysler was more oscillating. The figure showed a moderate decline in the first year with its production time requiring around 32 hours. Then falling sharply to roughly 29 hours at the end of the period, keeping it among the least efficient manufacturers.
By contrast, Ford mirrored this trend albeit in reverse. Its production time rose slightly from 25 to 27 hours between 1998 and 2001 before dropping back to around 26 hours at the end of the period.