The information about the average time to produce different modes of car manufacturers was delineated through the line graph.
Looking at an overall perspective, there was a decline in the average time of four factories with the most dramatic fall being seen in General Motors.
From 1998 to 2001, the correlation could be seen in all modes of car, in which, concerning Ford and General Motor, both of them not only accounted for the largest amount of time being produced but also showed a reverse tendency when a considerable fall was for General Motor, which was from a peak at 32 hours to under 28 hours in 2001, the other experienced an upward pattern when having risen from 28 to nearly 32 hours over the period. A similar tendency once appeared in the two others, Toyota and Honda, with their starting point at 22 hours in 1998 but the latter decreased by about 2 hours just after one year, the increased portion by approximately 1 hour was seen in Toyota. However, for the next timescale, the recovery occurred in both types of car manufacturers when they backed to the beginning mark after having moved increasingly and decreasingly respectively.
After a year from 2001, Ford started to keep a similar down pace as General Motor, when having decreased to under 30 hours, which was still higher than under 26 hours of General Motor. Toyota and Honda also kept the same trend when having increased to 24 hours in 2002 at the same time. Nevertheless, for the last period, a fluctuation continually happened, in which, Ford constantly went down, evenly losing its position to be under General Motors with nearly 22 hours in the manufacturing process, General Motors still kept a downward trend and reached the point at 22 hours. Meanwhile, the two others, from 2002 to 2005, both of companies witnessed a fall to 20 hours, which was just lower by about 2 hours compared to the beginning point.