The line graph illustrates the average hours spent on making a car by four US car factories namely General Motor, Ford, Toyota and Honda over seven years from 1998 to 2005.
Overall, there was a considerable downward trend in hours for all four types of factories, with the most significant fall in General Motor.
To commence, General motor had lead the figure for the longest time in one year with 32 hours. For the next 6 years, the amount of time constantly decreased until it hit a low of 22 hours by the end of the period. Ford, starting with 28 hours, showed remarkable rise for over three years until reaching a peak of approximately 31 hours before witnessing a sharply decrease to 21 hours in 2005.
According to the remaining pattern, Toyota and Honda both start at 22 hours. While Toyota slightly rose by one hour for the first year, Honda showed a reverse trend with a small drop of 2 hours in the first year. For the next three years, they witnessed a fluctuating change and then rose to nearly 24 hours in 2002. From 2002 to 2005, both showed a decreased trend and reached 20 hours by the end of the period.