The graph below shows the amount of hours spend for production of one vehicle by 4 companies.

The given line graph provides information about how much time the companies need to manufacture a motor vehicle. Overall, Audi experienced a downward trend over the period. Nissan plotted a fluctuation. Meanwhile, Volvo remained steady while Mercedes showed a slight surge. At the beginning of the period, Audi has been spent the highest amount of time to produce a car by almost 33 hours in 1999. However, It dramatically started to decline to a little below 25 hours in 2003 and continued to decrease to approximately 23 hours at the end of the period. Volvo has not shown any movement on the hours during the entire period, which means it followed the strait line by around 23 hours throughout the period. Mercedes was consuming about 25 hours to create a brand-new car in 1999. The time they used to make a car started to rise in 2000, and it culminated in 2002 with 25 hours, then it displayed a gradual decrease to roughly 24 hours in 2006. Nissan started its waiving experience in 1999 with almost 22 hours, and it dropped to 20 hours in 2000. Nissan’s hours maintained current values from 2000 to 2002, then rocketed to almost 23 hours that the same band as Volvo. After 2004, it declined to 20 hours again, and it finished the timeline by catching the Volvo again in 2006.